Tullow Tank Séan O'Brien is returning home to Leinster to take up his first coaching role.
O'Brien, 35, hung up his boots recently after a three-year stint away from his home province with London Irish.
He made 126 appearances for the Blues between 2009 and 2019. The former Leinster and Ireland back row, will replace Denis Leamy as the Blues' contact skills coach.
