
There are two changes to the starting line-up of the team that played last Sunday - Kieran Roche starts at blindside flanker and Paul Hodgson comes in at scrum half.
"We produced a top class performance against Saracens last Sunday and showed what a quality side we can be," said London Irish Head Coach Toby Booth. "We need to maintain those standards as we head into the second half of the season.
"After watching Northampton in recent weeks, it is clear that they contest the breakdown very hard and push the laws to the limit. We will need to focus on that aspect of tomorrow's match to ensure we have a good attacking platform," Booth added.
Team: 15. Delon Armitage*; 14. Tom Homer; 13. Elvis Seveali'i*; 12. Seilala Mapusua*; 11. Peter Hewat; 10. Chris Malone; 9. Paul Hodgson*; 1. Clarke Dermody*; 2. David Paice*, 3. Paulica Ion*; 4. Nick Kennedy*; 5. Bob Casey*; 6. Kieran Roche; 7. Steffon Armitage*; 8. Chris Hala'Ufia*
Replacements: 16. Danie Coetzee*; 17. Dan Murphy; 18. Faan Rautenbach*; 19. Andy Perry; 20. Jonathon Fisher; 21. John Rudd; 22. Ryan Lamb; 23. Alfredo Lalanne*
* Denotes international
Head Coach: Toby Booth; Attack Coach: Mike Catt; Defence Coach: Dave Ellis