| Position | D |
| Birth city | Turku, undefined, FIN |
| Birth date | 1994-10-27 (31) |
| Height | 6'4'' |
| weight (lb) | 208 |
| Drafted | pick 8 round 1 by BUF in 2013 |
season | L | T. | GP | G | A | PTS | +/- | pim |
|---|---|---|---|---|---|---|---|---|
| 2013-14 | NHL | Buffalo Sabres | 34 | 2 | 2 | 4 | -15 | 6 |
| 2014-15 | NHL | Buffalo Sabres | 78 | 8 | 12 | 20 | -32 | 26 |
| 2015-16 | NHL | Buffalo Sabres | 82 | 9 | 32 | 41 | -21 | 33 |
| 2016-17 | NHL | Buffalo Sabres | 79 | 6 | 39 | 45 | -9 | 58 |
| 2017-18 | NHL | Buffalo Sabres | 73 | 6 | 35 | 41 | -25 | 48 |
| 2018-19 | NHL | Buffalo Sabres | 78 | 5 | 38 | 43 | -41 | 38 |
| 2019-20 | NHL | Buffalo Sabres | 69 | 6 | 27 | 33 | -2 | 46 |
| 2020-21 | NHL | Buffalo Sabres | 49 | 4 | 14 | 18 | -18 | 36 |
| 2021-22 | NHL | Philadelphia Flyers | 66 | 2 | 14 | 16 | -9 | 38 |
| 2022-23 | NHL | Philadelphia Flyers | 74 | 3 | 17 | 20 | -4 | 32 |
| 2023-24 | NHL | Philadelphia Flyers | 31 | 1 | 3 | 4 | -6 | 8 |
| 2024-25 | NHL | Philadelphia Flyers | 63 | 4 | 15 | 19 | 3 | 14 |
| 2025-26 | NHL | Philadelphia Flyers | 44 | 1 | 13 | 14 | 10 | 16 |
| 2026-27 | NHL | Philadelphia Flyers | 3 | 1 | 0 | 1 | 0 | 0 |
| NHL Total | 823 | 58 | 261 | 319 | -169 | 399 | ||
season | L | T. | GP | G | A | PTS | +/- | pim |
|---|---|---|---|---|---|---|---|---|
| 2025-26 | NHL | Philadelphia Flyers | 10 | 1 | 4 | 5 | 1 | 20 |
| NHL Total | 10 | 1 | 4 | 5 | 1 | 20 | ||