Cian Healy has emerged as a doubt for Ireland's autumn internationals.

The Leinster prop picked up a hamstring injury that will rule him out of action for at least four weeks.

Healy will almost certainly miss both of Leinster's opening games in Pool 2 of the Champions Cup against Wasps and Castres.

Sean O'Brien's continuing ankle problems also place him in doubt for the start of Leinster's European odyssey.

Ireland will take on South Africa, Georgia and Australia in November.