| Personal information | |||
|---|---|---|---|
| Date of birth | 11 December 1991 | ||
| Place of birth | Calafat, Romania | ||
| Height | 1.85 m (6 ft 1 in) | ||
| Positions | |||
| Team information | |||
Current team | Athens Kallithea | ||
| Number | 5 | ||
| Youth career | |||
| –2007 | Dunărea Calafat | ||
| 2007–2008 | Şcoala de Fotbal Gheorghe Popescu | ||
| 2008–2011 | Roma | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| 2011–2015 | Roma | 0 | (0) |
| 2011–2012 | → Chindia Târgoviște (loan) | 20 | (0) |
| 2012–2013 | → Viitorul Constanța (loan) | 20 | (0) |
| 2013–2014 | → Olhanense (loan) | 16 | (0) |
| 2014–2015 | → Südtirol (loan) | 35 | (0) |
| 2015–2016 | Südtirol | 28 | (0) |
| 2017–2021 | Viitorul Constanța | 133 | (2) |
| 2021–2022 | Farul Constanța | 36 | (0) |
| 2022–2026 | Panetolikos | 86 | (1) |
| 2026– | Athens Kallithea | 0 | (0) |
| International career | |||
| 2007–2008 | Romania U17 | 3 | (0) |
| 2008–2009 | Romania U19 | 6 | (0) |
| 2009–2012 | Romania U21 | 5 | (0) |
| * Club domestic league appearances and goals as of 17 May 2026 | |||
Sebastian Mladen (born 11 December 1991) is a Romanian professional footballer who plays as a defender or a defensive midfielder for Super League Greece 2 club Athens Kallithea.
| Club | Season | League | National cup | Europe | Other | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Division | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | ||
| Chindia Targoviște (loan) | 2011–12 | Liga II | 20 | 0 | — | — | — | 20 | 0 | |||
| Olhanense (loan) | 2013–14 | Primeira Liga | 16 | 0 | 1 | 0 | — | — | 17 | 0 | ||
| Südtirol (loan) | 2014–15 | Lega Pro | 35 | 0 | 0 | 0 | — | — | 35 | 0 | ||
| Südtirol | 2015–16 | Lega Pro | 28 | 0 | 2 | 0 | — | — | 30 | 0 | ||
| Total | 63 | 0 | 2 | 0 | — | — | 65 | 0 | ||||
| Viitorul Constanța (loan) | 2012–13 | Liga I | 20 | 0 | — | — | — | 20 | 0 | |||
| Viitorul Constanța | 2016–17 | Liga I | 2 | 0 | — | — | — | 2 | 0 | |||
| 2017–18 | Liga I | 34 | 1 | — | 2 | 0 | 0 | 0 | 36 | 1 | ||
| 2018–19 | Liga I | 30 | 1 | 3 | 0 | 4 | 0 | — | 37 | 1 | ||
| 2019–20 | Liga I | 32 | 0 | — | 2 | 1 | 1 | 0 | 35 | 1 | ||
| 2020–21 | Liga I | 35 | 0 | 0 | 0 | — | 2 | 0 | 37 | 0 | ||
| Total | 133 | 2 | 3 | 0 | 8 | 1 | 3 | 0 | 147 | 3 | ||
| Farul Constanța | 2021–22 | Liga I | 32 | 0 | 1 | 0 | — | — | 33 | 0 | ||
| 2022–23 | Liga I | 4 | 0 | — | — | — | 4 | 0 | ||||
| Total | 36 | 0 | 1 | 0 | — | — | 37 | 0 | ||||
| Panetolikos | 2022–23 | Super League Greece | 31 | 0 | 0 | 0 | — | — | 31 | 0 | ||
| 2023–24 | Super League Greece | 22 | 1 | 4 | 0 | — | — | 26 | 1 | |||
| 2024–25 | Super League Greece | 24 | 0 | 1 | 0 | — | — | 25 | 0 | |||
| 2025–26 | Super League Greece | 9 | 0 | 0 | 0 | — | — | 9 | 0 | |||
| Total | 86 | 1 | 5 | 0 | — | — | 91 | 1 | ||||
| Athens Kallithea | 2026–27 | Super League Greece 2 | 0 | 0 | 1 | 0 | — | — | 1 | 0 | ||
| Career total | 374 | 3 | 13 | 0 | 8 | 1 | 3 | 0 | 398 | 4 | ||