| Liiga | 29/04/18 | Ilves Tampere | - | SJK Seinäjoki | 1:1 | ||||
| Liiga | 30/06/18 | Kuopion PS | - | SJK Seinäjoki | 1:1 |  |
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| Liiga | 20/08/18 | SJK Seinäjoki | - | Ilves Tampere | 2:3 |
| Liiga | 29/04/18 | Ilves Tampere | - | SJK Seinäjoki | 1:1 | ||||
| Liiga | 30/06/18 | Kuopion PS | - | SJK Seinäjoki | 1:1 | |
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| Liiga | 20/08/18 | SJK Seinäjoki | - | Ilves Tampere | 2:3 |
| Joonas Sebastian Sundman | |
| Born: | 20.01.1998 |
| Place of birth: |
Seinäjoki, 
Finland |
| Nationality: |
Finland
|
| Height: | 186 cm |
| Position(s): | Left Back Centre Back |
| Foot: | left |