LEINSTER captain Brian O'Driscoll has been ruled out of their Heineken Cup quarter-final match against Wasps at the end of the month.

The Irish captain picked up a hamstring injury against Italy and will be out for four to six weeks.

He would even be doubtful for the semi-finals if Leinster progressed.

O'Driscoll has scored 20 tries in 45 Heineken Cup games.