Teams Fionn O'Sullivan played for
| Irish Senior Cup | Leinster (2018) |
| Leinster League | Leinster Second XI (2016-2017) |
| Leinster (2017-2018) | |
| Leinster Cups | Leinster Second XI (2017) |
| Leinster Twenty20 | Leinster (2017) |
| Miscellaneous | Leinster Under-13s (2014) |
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