Leinster are set to be without Jack McGrath for their vital European Champions Cup pool games against both Castres and Wasps.

The Guinness Pro 12 independent disciplinary panel have banned the loosehead prop for three weeks after finding him guilty of stamping on Ulster's Rory Best during last Saturday's derby.

McGrath has the right to appeal against the punishment and Leinster are expected to take that option after the province and expressed disappointment with the initial decision to cite the player.