**Brian O’Driscoll has backed Leinster to end Exeter Chiefs' Heineken Champions Cup title defence on Saturday.** But O’Driscoll also predicts “a really, really close game” in the stand-out fixture of this season’s quarter-finals. Leinster are among only four teams to have successfully defended the European title, which former Ireland captain O’Driscoll helped them achieve in 2012. Exeter are now chasing membership of that exclusive club, while victory for Leinster at Sandy Park would leave them two wins away from a record fifth triumph in the competition.