Connacht coach Pat Lam says the IRFU blocked his son Mitch playing for the province for free.
The Pro 12 champions are in the midst of an injury crisis and Lam says his son – who's played for the Connacht Eagles – was not allowed join the senior squad as cover.
Squads are only allowed a certain number of foreign players.
Jack Carty, Marnitz Boshoff, Craig Ronaldson and Shane O'Leary are all out injured at the moment – Ultan Dillane will also be out for around 5 weeks with an ankle injury.
