Sean O'Brien History
| Club | Country | Position | NO | From | To |
|---|---|---|---|---|---|
| Leinster | Ireland | Openside Flanker | 01/08/2007 | 01/02/2020 | |
| Ireland A | Ireland | Openside Flanker | 01/01/2009 | ||
| British Lions (NT) | British Isles | Openside Flanker | 01/06/2013 | 10/07/2017 | |
| London Irish | England | Openside Flanker | 01/02/2020 |
| Country | Position | From | To |
|---|---|---|---|
| Ireland | Openside Flanker | 01/08/2009 | |
| British Lions | Openside Flanker | 01/06/2013 | 10/07/2017 |
NO = Player number .