The former Ireland coach has taken to Twitter to thank well wishers after his appointment by the French club was confirmed.
The Cork native had been recently linked with a position in the backroom team at Munster, but says he's really looking
forward to a new and exciting challenge at the club.
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O'Sullivan's first task will be to get Biarritz promoted from the second tier, following their relegation from the Top 14 this season.
