Isma Sierra

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 2 youth-team spells in the full career.

Scout report

Squad depthCentral defender

Isma Sierra is a 23-year-old central defender at Villarreal, rated 66.3 overall by Field Insider's model. An emerging talent, he has been a fringe squad member this season (0% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Sierra.

On the season, Sierra graded 0 for current form (age-blind), on 0 clean sheets and 0 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 66. At 23 Sierra is still climbing toward his ceiling, and a market index of 73.2 reflects that trajectory.

66.3

Ratingi

a strong, regular top-tier starter

Seasoni

below regular-starter level

Minutes

limited game time

Def. actions / 90

light defensive volume

Output in context · Villarreal finished 3rd of 20 · an upper-table side

Apps

Goals

Assists

Clean sheets

No league appearances recorded this season, so there's no output sample to read yet.

Strengths

Pedigree. Performing in a top-tier setting (team strength 95/100).

Watch points

Game time. Only 0% of available minutes — needs a settled run to prove the level.

Outlook

Rated 66.3 overall — a strong, regular top-tier starter. Defensively he reads as light defensive volume (0 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.

Per 90 & availability

Minutes played %0%

Available fixtures38 of 38

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 900

Player flow

Goal involvements0

Cards / 900

Value & potential by age

Market valueRating

Solid = now · dashed = projected

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 (~73), then tapers with age. At 23, Sierra sits on 73.2, at or near its peak. The blue line is Sierra's projected Rating — 66.3 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.

Transfer history

Estoril(back from loan)2025/26 – now

Osasuna IIuntil 2025/26

Estoril(back from loan)2025/26 – 2025/26

Villarreal(on loan)until 2025/26

Villarreal II(on loan)2025/26 – 2025/26

Estoril2024/25 – 2025/26Free

Real Betis2024/25 – 2024/25

Terueluntil 2024/25

Osasuna II(on loan)2024/25 – 2024/25

Estoril(back from loan)2024/25 – 2024/25

Osasunauntil 2024/25

About Isma Sierra

Ismael Sierra Arnal is a 23-year-old centre-back who plays for Villarreal, born on March 17, 2003 in Huesca, standing 192 cm tall. He is from Spain. Villarreal currently sit 3rd of 20 in the La Liga.

Field Insider's view

Field Insider currently rates Isma Sierra at 66.3 with a Season form score of 0. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 3 recorded seasons, Isma Sierra has totalled 62 club appearances with 1 goal and 0 assists for 4 different clubs. His busiest campaign came in 2023/24, with 23 appearances for Teruel.

Isma Sierra's career has also included time at Estoril, Osasuna II, Villarreal II, Real Betis, Teruel and Osasuna.

Transfer news

No transfer news found for this player.