ratings updated 20 Aug 2026
Profile
Season stats
Full career & schedule →Domestic-league season · Mazatlán.
Scout report
J. Sierra is a 29-year-old central midfielder at Mazatlán, rated 30 overall by Field Insider's model, ranking 33rd of 56 on scout potential in the Liga MX. An experienced operator, he has been a rotation option this season (51.7% of available minutes). His defensive output reads 2.73 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 25 — a workmanlike campaign that ranks 5th of 12 of the 12 central midfielders in the Liga MX, on 3 goals, 0 assists and 2.729 defensive actions per 90.
Year-on-year, that's broadly in line with last season (Season 22 → 25). Across the 3 seasons we hold, it's his best return yet.
On long-term talent our Rating reads 30, 10th of 12 of the 12 central midfielders in the Liga MX. At 29 Sierra is in his prime years, and a market index of 5.8 reflects that trajectory.
Sierra is operating at his career peak — the 2025/26 level is the level.
Output in context · Mazatlán finished 16th of 18 · a relegation-threatened side
2.73 tackles, blocks & interceptions per 90 — moderate defensive volume, with 1 clean sheet across 19 appearances. Doing that for a relegation-threatened side (16th 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. Going forward he chipped in 3 goals and 0 assists — a useful bonus from the back.
Strengths
- Attacking threat. Chips in from deep: 0.17 goal involvements per 90, useful for a central midfielder.
Watch points
- Game time. Only 51.7% of available minutes — needs a settled run to prove the level.
- Level. Rates below a nailed-on top-tier starter on our model.
Outlook
With a Rating of 30, Sierra carries the 10th-highest potential of the central midfielders in the Liga MX of 12, and he is posting that for a relegation-threatened side (Mazatlán finished 16th of 18) — individual numbers are harder to earn on a struggling team, so his underlying level likely sits a touch above the ranking. Defensively he reads as moderate defensive volume (2.73 tackles, blocks & interceptions per 90). Experienced and reliable, but the value curve is easing (1.1× now → 0.8× projected in three years).
Generated from Field Insider's rating model · AI-written analysis to follow.
Season statistics
Bars = where he ranks among central midfielders in the Liga MX with 600+ minutes this season.
Shooting
Passing
Possession
Defending
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Transfer news
No transfer news found for this player.
