Marshall 'told to take summer off' after three consecutive concussions

Ulster centre Luke Marshall has been ruled out of Ireland's tour of North America next month, after suffering concussion in three consecutive games this season.

Marshall was forced off the field with head injuries three times in four weeks, suffering concsussion against France and Italy in the final two rounds of the RBS Six Nations, before sustaining another knock to the head in Ulster’s Heineken Cup semi-final against Saracens.