Ross Byrne will start at out-half in place of the injured Jonathan Sexton for Leinster's Heineken Champions Cup meeting with Northampton.
That's one of five changes from the side that ran out convincing winners at Franklin's Gardens last week.
Luke McGrath partners Byrne in the half-backs, while James Tracy and Tadhg Furlong come into the front row.
Scott Fardy captains the side from the second row.
Prop John Ryan replaces Stephen Archer in the only Munster change for their trip to Saracens in Pool 4
The defending champions have recalled their big guns with Owen Farrell, the Vunipola brothers, and Jamie George among those starting.
Jack Carty's been named at full-back for Connacht's meeting with Gloucester in Galway.
Captain Jarrad Butler will earn his 50th Connacht cap.
Stock image: Shutterstock.
Ulster will look to continue their winning start to Pool 3 tonight.
Dan McFarland's side are at the Twickenham Stoop to face Harlequins with kick-off at 7.45.