Trimble finger surgery could upset Ulster Heineken plans

Trimble picked up the injury in last week’s defeat to the Dragons and his place in this evening’s RaboDirect Pro12 home date with Glasgow is taken by David McIlwaine, who switches from the left with Michael Allen coming onto the right wing from the bench.

Coach Mark Anscombe has made five personnel changes and gives exiting scrum-half prospect Ian Porter his first Pro12 start in tandem with fly-half Paddy Jackson. Porter is also a high duty goal-kicker and features against a vibrant Warriors outfit along with No 8 Nick Williams, tight head Declan Fitzpatrick and openside Sean Doyle, who get their first starts of the season, while Roger Wilson moves to blind side.