**Gavin Coombes will make his 50th Munster appearance when Leinster visit Thomond Park for a hugely significant fixture at the top of the United Rugby Championship.** Leinster hold a five-point lead at the summit, with Ulster in second and Munster a further three points back. A win in Limerick would land a sizeable blow in the race to top the table. Coombes signed a new Munster contract this week and will follow that up by achieving his half-century against Leinster, while both sides welcome back a host of Ireland Triple Crown winners. Munster have Peter O'Mahony, Joey Carbery and Conor Murray back among nine changes, while Garry Ringrose, Robbie Henshaw, Josh van der Flier and Jack Conan are among the international stars returning for the visitors.