| J. ŁabojkoDefensive midfielder |  Piast Gliwice | 🇵🇱Poland | 28 | 1 | 0 | 2.2 | 15▲43.9%↩ | 24▼19.7%↩ |
| J. LähteenmäkiFull-back |  FC Nordsjaelland | 🇫🇮Finland | 20 | 2 | 2 | 7.9 | 30▲173.4% | 46▲15.7% |
| J. La BarbaCentre-back | Pescara | 🇮🇹Italy | 2025 | 0 | 0 | 0.3 | 0 | 3 |
| J. L. ArandaCentre-back | Valladolid | 🏳️ | 19 | 0 | 0 | 17.9 | 0 | 53 |
| J. KwizeraCentre-forward |  Rhode Island | 🇨🇩Congo DR | 27 | 0 | 0 | 2.7 | 0 | 22▼32.3%↩ |
| J. Kusi-AsareCentre-forward |  Fulham | 🇸🇪Sweden | 19 | 0 | 0 | 68.1 | 0 | 71▲3.8%↩ |
| J. KumiCentral midfielder |  Sassuolo | 🇮🇹Italy | 22 | 1 | 0 | 40.9 | 12▲650%↩ | 57▲6.2%↩ |
| J. KügelCentral midfielder |  FC Ingolstadt 04 | 🇩🇪Germany | 29 | 1 | 2 | 2.4 | 12▲51.3% | 23▼32.6% |
| J. KudskCentre-back |  FC Fredericia | 🇩🇰Denmark | 23 | 1 | 0 | 7.5 | 11▲761.5%↩ | 40▲9%↩ |
| J. KuchtaCentre-forward |  Sparta Praha | 🇨🇿Czechia | 29 | 12 | 6 | 0 | 32▲362.3%↩ | 1▼96.1%↩ |
| J. KucharskiCentral midfielder |  Perth Glory | 🇦🇺Australia | 24 | 3 | 3 | 1.1 | 28 | 19 |
| J. KučeraDefensive midfielder |  Hradec Králové | 🇨🇿Czechia | 29 | 1 | 2 | 0 | 13 | 1 |
| J. KubickiCentral midfielder |  Gornik Zabrze | 🇵🇱Poland | 31 | 3 | 4 | 2.4 | 33▲30.7%↩ | 22▼27.6%↩ |
| J. KrzywanskiGoalkeeper |  Widzew Łódź | 🇵🇱Poland | 23 | 0 | 0 | 4.2 | 0 | 29 |
| J. KrumreyGoalkeeper | VfL Osnabrück | 🇩🇪Germany | 22 | 0 | 1 | 8.1 | 17▲437.5%↩ | 61▲60.5%↩ |
| J. KruiverFull-back |  Roda | 🇳🇱Netherlands | 25 | 1 | 3 | 16.4 | 33▼20.6% | 55▼1.6% |
| J. KrugerCentre-back |  Club Atlético Güemes | 🇦🇷Argentina | 25 | 0 | 0 | 5.7 | 9 | 33 |
| J. KronigCentre-back |  FC Sion | 🇨🇭Switzerland | 26 | 1 | 0 | 13.9 | 45 | 43 |
| J. KrivákCentre-back |  FK Košice | 🇸🇰Slovakia | 32 | 2 | 0 | 0.6 | 7 | 12 |
| J. KřišťanDefensive midfielder |  Karviná | 🇨🇿Czech Republic | 24 | 0 | 0 | 0 | 4 | 2 |
| J. KrilanovichCentre-forward |  Arsenal Sarandi | 🇦🇷Argentina | 24 | 0 | 0 | 5.2 | 0 | 30 |
| J. KrassoWinger |  Paris FC | 🇨🇮Côte d'Ivoire | 29 | 2 | 2 | 14 | 16▼75.3% | 44▼24.4% |
| J. KranthoveFull-back |  AS Trencin | 🇳🇱Netherlands | 25 | 0 | 1 | 3.3 | 4 | 28 |
| J. KramerCentre-back |  GO Ahead Eagles | 🇳🇱Netherlands | 30 | 0 | 0 | 6.3 | 41±0% | 44±0% |
| J. KrálCentre-back |  Sigma Olomouc | 🇨🇿Czechia | 27 | 0 | 0 | 0 | 20 | 1▼96%↩ |
| J. KrahlGoalkeeper |  1. FC Kaiserslautern | 🇩🇪Germany | 26 | 0 | 0 | 23.1 | 20±0% | 61▼8.3% |
| J. KoželuhFull-back |  Slovan Liberec | 🇨🇿Czechia | 24 | 0 | 1 | 0 | 12 | 1 |
| J. KowalskiCentral midfielder |  Arka Gdynia | 🇵🇱Poland | 20 | 0 | 0 | 3.7 | 0 | 31 |
| J. KovaříkCentral midfielder |  Bohemians 1905 | 🇨🇿Czechia | 38 | 1 | 0 | 0 | 6 | 0 |
| J. KoutroumbisFull-back |  Motherwell | 🇦🇺Australia | 28 | 1 | 0 | 6.6 | 29▲525.5% | 32▼5.3% |
| J. KoundéFull-back |  Barcelona | 🇫🇷France | 27 | 1 | 3 | 86.5 | 47▲6.6% | 71▼17% |
| J. KouassiWinger |  Hangzhou Greentown | 🇨🇮Côte d'Ivoire | 31 | 1 | 1 | 0.5 | 5▼78.9%↩ | 11▼70.8%↩ |
| J. KouadioCentre-back |  Annecy | 🇫🇷France | 26 | 0 | 1 | 28.6 | 46▲37% | 58▲3% |
| J. KotulaDefensive midfielder |  Tatran Prešov | 🇸🇰Slovakia | 30 | 0 | 0 | 1 | 10 | 17 |
| J. KorteCentral midfielder |  Preußen Münster | 🇩🇪Germany | 23 | 0 | 0 | 17.4 | 0 | 46 |
| J. KorsakselCentral midfielder |  Raufoss | 🇳🇴Norway | 18 | 0 | 0 | 2.4 | 0 | 27 |
| J. KoromaCentre-forward |  Chesterfield | 🏴England | 27 | 3 | 2 | 2.7 | 13▼58.8%↩ | 34▼26.9%↩ |
| J. KopicCentral midfielder |  Plzen | 🇨🇿Czechia | 36 | 0 | 0 | 0 | 0 | 0 |
| J. Konstali-LødemelCentral midfielder |  hodd | 🇳🇴Norway | 20 | 0 | 0 | 2.8 | 0 | 28▼1.4%↩ |
| J. KongoloCentre-back |  Genk | 🇧🇪Belgium | 20 | 0 | 0 | 14.1 | 14▲19.1%↩ | 53▲31.9%↩ |
| J. KoneCentre-forward | Nantes | 🏳️ | 18 | 0 | 0 | 27.1 | 0 | 62 |
| J. KomarCentre-back |  Rosario Central | 🇦🇷Argentina | 29 | 0 | 0 | 8.3 | 52▲74.4% | 34▼8.8% |
| J. KollerAttacking midfielder |  Jong PSV U21 | 🇳🇱Netherlands | 19 | 6 | 0 | 13.1 | 20▼11.4%↩ | 56▲4.3%↩ |
| J. KolísekAttacking midfielder |  Slavia Praha | 🇨🇿Czechia | 18 | 0 | 0 | 0 | 0 | 2 |
| J. KolbeinshavnCentral midfielder | Start | 🇳🇴Norway | 17 | 0 | 0 | 4.3 | 0 | 34 |
| J. KoláříkAttacking midfielder |  Mlada Boleslav | 🇨🇿Czechia | 19 | 5 | 2 | 0 | 15 | 2 |
| J. KolářCentre-back |  Zlin | 🇨🇿Czechia | 26 | 1 | 1 | 0 | 13 | 1 |
| J. KolanCentral midfielder |  Zaglebie Lubin | 🇵🇱Poland | 22 | 1 | 1 | 4.9 | 17▲65.4% | 36▲1.4% |
| J. KokosinskiCentre-forward | GKS Katowice | 🏳️ | 18 | 0 | 0 | 3.6 | 0 | 33 |
| J. KodamaGoalkeeper |  Consadole Sapporo | 🇯🇵Japan | 28 | 0 | 0 | 2.3 | 0 | 22 |
| J. KnutsenCentre-back | Skeid | 🇳🇴Norway | 28 | 0 | 0 | 1.2 | 0 | 17 |
| J. KnollmüllerCentre-forward |  FC BW Linz | 🇦🇹Austria | 23 | 0 | 0 | 6.6 | 0 | 34 |
| J. KnightFull-back |  Portsmouth | 🏴England | 28 | 0 | 0 | 11.8 | 10▼54.7%↩ | 43▼18.7%↩ |
| J. KnightCentral midfielder |  Bristol City | 🇮🇪Republic of Ireland | 25 | 0 | 2 | 29.4 | 22▼51.8% | 64▼18.2% |
| J. KnapíkCentre-back | Slovan Liberec | 🇨🇿Czechia | 25 | 0 | 0 | 0 | 0 | 1 |
| J. KluskensCentral midfielder |  VVV Venlo | 🇳🇱Netherlands | 23 | 0 | 0 | 13 | 3▲1500% | 44▲1.4% |
| J. KluivertCentre-forward |  Bournemouth | 🇳🇱Netherlands | 27 | 2 | 0 | 74.2 | 10▼82.4% | 62▼29.2% |
| J. KlinsmannGoalkeeper |  Cesena | 🇺🇸USA | 29 | 0 | 1 | 9.8 | 10▼36.7% | 45▼8.3% |
| J. KlimentCentre-forward | Sigma Olomouc | 🇨🇿Czechia | 32 | 1 | 0 | 0 | 3▼64.5%↩ | 1▼98.2%↩ |
| J. KlímaCentre-forward | Mlada Boleslav | 🇨🇿Czechia | 29 | 3 | 1 | 0 | 8 | 1 |
| J. KleinCentral midfielder |  Charleston Battery | 🇺🇸USA | 26 | 1 | 0 | 3.3 | 6▼34.1%↩ | 27▼29.7%↩ |
| J. KjærWinger |  Mjallby AIF | 🇩🇰Denmark | 22 | 2 | 1 | 4.2 | 19▲112.2% | 34▲0.6% |
| J. KizziFull-back |  Barnet | 🏴England | 33 | 2 | 1 | 0.5 | 11▼12.6%↩ | 9▼58.3%↩ |
| J. KiwiorCentre-back |  FC Porto | 🇵🇱Poland | 26 | 0 | 1 | 37.4 | 71▲301.7%↩ | 59▼24.1%↩ |
| J. KitolanoFull-back |  Aalesund | 🇳🇴Norway | 26 | 0 | 1 | 5.7 | 12▲65.7% | 32▲3.9% |
| J. KitolanoDefensive midfielder |  Bodo/Glimt | 🇳🇴Norway | 25 | 0 | 0 | 6.3 | 3▼93.5%↩ | 35▼50.1%↩ |
| J. KirbyCentre-forward |  Ostersunds FK | 🏴England | 30 | 2 | 0 | 0.6 | 9▼61.3%↩ | 14▼29.4%↩ |
| J. KinjoCentral midfielder | Sagamihara | 🇯🇵Japan | 29 | 0 | 0 | 0.6 | 0 | 13 |
| J. KingCentre-back |  Brisbane Roar | 🇦🇺Australia | 25 | 1 | 0 | 1.1 | 29▲595.2%↩ | 19▼49.6%↩ |
| J. KingCentre-forward |  Al Khaleej Saihat | 🇳🇴Norway | 34 | 20 | 2 | 3 | 64▲90.7%↩ | 20▼38.5%↩ |
| J. KindbergGoalkeeper |  Kalmar FF | 🇸🇪Sweden | 32 | 0 | 0 | 0.7 | 3▼31.1% | 13▲65.4% |
| J. KimmichAttacking midfielder |  Bayern München | 🇩🇪Germany | 31 | 2 | 8 | 15.8 | 35▼36.6% | 43▼28.7% |
| J. KiloDefensive midfielder |  ADO Den Haag | 🇫🇮Finland | 24 | 0 | 0 | 23.5 | 37±0% | 63±0% |
| J. KiilerichCentre-back |  Zulte Waregem | 🇩🇰Denmark | 26 | 0 | 0 | 16 | 25▲161.5%↩ | 50▲53.2%↩ |
| J. KiharaCentre-forward |  Tegevajaro Miyazaki | 🇯🇵Japan | 24 | 0 | 0 | 2 | 0 | 23 |
| J. KeyFull-back |  Swansea | 🏴England | 26 | 2 | 1 | 26 | 18▼52.7% | 57▼18.9% |
| J. KerskenGoalkeeper |  Arminia Bielefeld | 🇩🇪Germany | 25 | 0 | 0 | 23.7 | 11▼70.3% | 62▲25.3% |
| J. KerrCentre-back |  Hibernian | 🏴Scotland | 29 | 2 | 0 | 6 | 29▼40.2%↩ | 30▼26.9%↩ |
| J. KerkdijkCentre-back |  Heracles | 🏳️ | 0 | 0 | 0 | 14.9 | 0 | 54 |
| J. KeptoukouaCentre-forward |  RWDM | 🏳️ | 18 | 0 | 0 | 5.5 | 0 | 37 |
| J. KennyCentre-back |  PAOK | 🏴England | 29 | 0 | 1 | 3.7 | 38±0% | 26▼54.2%↩ |
| J. KennyCentre-forward |  Celtic | 🇮🇪Republic of Ireland | 23 | 4 | 2 | 10.2 | 15▲262.5% | 46▼1.5% |
| J. KennerydCentre-back |  IFK Varnamo | 🇸🇪Sweden | 22 | 0 | 0 | 1.6 | 0 | 22 |
| J. KellyCentral midfielder | Charleston Battery | 🇺🇸USA | 28 | 0 | 0 | 1.4 | 1▼96.4%↩ | 19▼51.1%↩ |
| J. KellyWinger |  AFC Wimbledon | 🇬🇧Northern Ireland | 27 | 0 | 0 | 6.2 | 0▼100% | 28▼10.4% |
| J. KeanGoalkeeper |  Burton Albion | 🏴England | 35 | 0 | 0 | 0.4 | 0 | 6 |
| J. KayembeFull-back | Genk | 🇨🇩Congo DR | 32 | 0 | 1 | 4.9 | 25▼45.9% | 23▼41.5% |
| J. KayCentre-back | Sheffield Wednesday | 🏳️ | 16 | 0 | 0 | 16.2 | 0 | 54 |
| J. KaukoCentral midfielder | Free Agents | 🇫🇮Finland | 36 | 0 | 1 | 0.2 | 20 | 7 |
| J. KatoCentral midfielder |  Imabari | 🇯🇵Japan | 31 | 0 | 0 | 1.3 | 0 | 16 |
| J. KarnerCentral midfielder |  TSV Hartberg | 🇦🇹Austria | 21 | 0 | 0 | 6.3 | 0 | 36 |
| J. KarlstrømGoalkeeper |  Molde | 🇳🇴Norway | 29 | 0 | 1 | 3.8 | 23▲102.6%↩ | 32▲22.6%↩ |
| J. KarlströmCentral midfielder |  Udinese | 🇸🇪Sweden | 31 | 1 | 0 | 15.4 | 33▼13.4% | 45▼19.7% |
| J. KarlssonCentre-back |  Malmo FF | 🇸🇪Sweden | 25 | 0 | 0 | 3.7 | 8▼50% | 29▼5.5% |
| J. KarlssonCentral midfielder |  Bologna | 🇸🇪Sweden | 28 | 5 | 0 | 19.8 | 20▲114.1% | 31▼48.5% |
| J. KarlssonCentre-back |  Vasteras SK FK | 🇸🇪Sweden | 22 | 0 | 0 | 4 | 7▲119.4%↩ | 33▲5.1%↩ |
| J. KarleseAttacking midfielder |  Golden Arrows | 🇿🇦South Africa | 24 | 2 | 3 | 0 | 10 | 2 |
| J. KaprofCentre-forward |  Quilmes | 🇦🇷Argentina | 31 | 1 | 1 | 1.2 | 4▲28.1%↩ | 15▼56%↩ |
| J. KaparosCentral midfielder |  Patro Eisden | 🇳🇱Netherlands | 24 | 0 | 0 | 7.3 | 1▼89.7%↩ | 36▼6.5%↩ |
| J. KaniaWinger | De Graafschap | 🇩🇪Germany | 24 | 1 | 0 | 13.9 | 4▼70.9%↩ | 51▲15.8%↩ |
