Domestic-league season · Mazatlán.
| Competition | Apps | G | A | Min | Match |
|---|---|---|---|---|---|
 Liga MX | 19 | 3 | 0 | 1583 | 6.64 |
 Leagues Cup | 2 | 0 | 0 | 90 | 6.5 |
J. Sierra is a 29-year-old central midfielder at Mazatlán, rated 30 overall by Field Insider's model, ranking 235th of 341 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 solid campaign that ranks top 35% of the 58 central midfielders in the Liga MX, on 3 goals, 0 assists and 2.729 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 30, 39th of 58 of the 58 central midfielders in the Liga MX. At 29 Sierra is in his prime years, and a market index of 5.8 reflects that trajectory.
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.
With a Rating of 30, Sierra carries the 39th-highest potential of the central midfielders in the Liga MX of 58, 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.
The gold line is market value — an index (not €) blending rating, age and league. It climbs through the early 20s, peaks around ages 23–27 (~11), then tapers with age. At 29, Sierra sits on 5.8, past its peak and easing. The blue line is Sierra's projected Rating — 30 today — recomputed at each age, so it follows the same rise-and-fall as a career matures and declines. Solid = up to today; dashed = projected.
No transfer news found for this player.
