ratings updated 20 Aug 2026
Profile
Season stats
Full career & schedule →Domestic-league season · Estoril.
Performance data · by competition
| Competition | Apps | G | A | Min | Match |
|---|---|---|---|---|---|
 Primeira Liga | 1 | 0 | 0 | 90 | 6.9 |
Scout report
★ Standout performer
All Primeira Liga standouts →First senior season on record — and already on the pitch for 88% of Estoril's available minutes, one of the top game-time debuts in the Primeira Liga this season.
Isma Sierra is a 23-year-old central defender at Estoril, rated 53.1 overall by Field Insider's model, ranking 66th of 133 on scout potential in the Primeira Liga. An emerging talent, he has been a rotation option this season (41.2% of available minutes). His defensive output reads 3.57 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Sierra.
Judged on this season alone, Sierra graded 13 — a workmanlike campaign that ranks 35th of 36 of the 36 centre-backs in the Primeira Liga, on 1 clean sheet and 3.571 defensive actions per 90.
We hold a single season for Sierra, so there's no year-on-year comparison to draw yet — the read above is this campaign only.
On long-term talent our Rating reads 53, 17th of 36 of the 36 centre-backs in the Primeira Liga. At 23 Sierra is still climbing toward his ceiling, and a market index of 20.3 reflects that trajectory.
Output in context · Estoril finished 18th of 18 · a relegation-threatened side
3.57 tackles, blocks & interceptions per 90 — solid defensive volume, with 1 clean sheet across 7 appearances. Doing that for a relegation-threatened side (18th of 18) is harder than the bare numbers suggest: a back line under more pressure has to defend more often and protects fewer leads, so the volume — and any clean sheets — carry real weight.
Strengths
- Defensive volume. 3.57 tackles, blocks & interceptions per 90 — does the unseen work.
Watch points
- Game time. Only 41.2% of available minutes — needs a settled run to prove the level.
Outlook
With a Rating of 53.1, Sierra carries the 17th-highest potential of the centre-backs in the Primeira Liga of 36 — though on just 7 appearances this season, so the standing rests on a small sample. Defensively he reads as solid defensive volume (3.57 tackles, blocks & interceptions per 90). Approaching peak years; value is still building (price multiplier 2×) with the best seasons likely ahead. With this floor already at 23, the ceiling gets tested by a step up in level — one to track.
Generated from Field Insider's rating model · AI-written analysis to follow.
Season statistics
Bars = where he ranks among centre-backs in the Primeira Liga with 600+ minutes this season.
Shooting
Passing
Possession
Defending
Yellow/red cards
Transfer news
No transfer news found for this player.
