| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2017/2018 | Segunda B - Group 3 | 16 | 742 | 1 | 0 | 0.12 | — |
| 2017/2018 | Segunda B - Group 1 | 26 | 1746 | 1 | 0 | 0.05 | — |
| 2018/2019 | Segunda B - Group 3 | 26 | 2281 | 0 | 0 | 0 | — |
| 2018/2019 | Segunda B - Group 1 | 34 | 2865 | 0 | 0 | 0 | — |
| 2019/2020 | Segunda B - Group 1 | 21 | 1890 | 2 | 0 | 0.1 | — |
| 2020/2021 | Segunda B - Group 1 | 17 | 1495 | 0 | 0 | 0 | — |
| 2022 | Veikkausliiga | 14 | 1176 | 0 | 0 | 0 | — |
| 2022/2023 | First League | 17 | 1510 | 0 | 0 | 0 | — |
| 2023/2024 | Liga 2 (Romania) | 14 | 1248 | 0 | 0 | 0 | — |
| 2024/2025 | Liga 2 (Romania) | 6 | 540 | 1 | 1 | 0.33 | 6.91 |
| 2025/2026 | Superliga (Romania) | 39 | 3330 | 3 | 1 | 0.11 | 6.88 |
| 2026/2027 | Superliga (Romania) | 6 | 496 | 0 | 0 | 0 | 6.96 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-09-02
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Universitatea Craiova | 5 | 2 | 0 | 3 | 0 | 0 | 0 | 0 |
 Dinamo Bucureşti | 4 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
 CFR Cluj | 4 | 2 | 1 | 1 | 1 | 0 | 1 | 0 |
 Rapid Bucuresti | 4 | 0 | 2 | 2 | 0 | 0 | 1 | 0 |
 Universitatea Cluj | 4 | 0 | 1 | 3 | 1 | 0 | 0 | 0 |
 Otelul | 3 | 1 | 0 | 2 | 1 | 0 | 0 | 0 |
 Csikszereda | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 |
 Botoşani | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 FCSB | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Mioveni | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Unirea Slobozia | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 UTA Arad | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Metaloglobus | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
 Şcolar Reşiţa | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Petrolul 52 | 2 | 1 | 0 | 1 | 0 | 0 | 1 | 0 |
 Farul Constanța | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 OFK Pirin | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Lokomotiv Plovdiv | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 |
 CSKA Sofia | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 HIFK | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Over 6 Superliga (Romania) games in 2026/2027 (496 minutes), Rober Sierra recorded no direct goal contributions. That season graded out at an average match rating of 6.96.
2026/2027's 6.96 stands as his career-best rating, with 2025/2026 (6.88) at the other end.
