Homer joined the Exiles in 2008 and progressed through the club’s Academy system.

He has made 110 appearances for Irish, scoring 780 points including 14 tries.

It is believed Homer's most likely destination next season will be Bath, where he will team up with former Exiles Toby Booth, Neil Hatley, Jonathan Joseph, Matt Garvey and Anthony Watson.

Commenting on the announcement, Bob Casey, Operations Director for London Irish said: “We did everything in our power to persuade Tom to stay.

"However, he feels that his future is elsewhere. We would like to thank him for his contribution to London Irish and wish him all the best for the future.”

Meanwhile, Irish will make three changes to their side for tomorrow's European Challenge Cup clash in Italy against Rovigo Delta (3pm ko).

Jimmy Stevens starts at hooker, following David Paice’s three week ban, packing down alongside Tom Court and Halani Aulika in the front row.

George Skivington captains the side from the second row with Jebb Sinclair.

Ofisa Treviranus moves onto the flank with Tom Guest moving to No.8 and Blair Cowan starts at openside.

Scott Steele and Shane Geraghty again start at nine and 10 respectively, with Eamonn Sheridan joined by Tom Fowlie in the midfield.

James Short comes into the side to start on the win, with Topsy Ojo on the other and Andrew Fenby at full back.

On the bench, Mike Mayhew returns from injury to be named alongside Leo Halavatau and Geoff Cross as the front row replacements.

Sean Cox and Kieran Low make up the rest of the forwards with Darren Allinson, Myles Dorrian and Tom Homer making up the backs replacements.

A win for Irish would seal top spot in their group and guarantee a home fixture in the quarter finals.

Delaney added: “We have made a few changes, some of the boys picked up niggles so we have been forced into a couple but the guys who have been picked thoroughly deserve their chance

"This is a huge game for us and we are under no illusions, this is going to be a very tough game.

"They have pushed the other teams in our pool close at their place so we will have to be on top of our game to get the result we need.”

London Irish: 1.Tom Court; 2.Jimmy Stevens; 3.Halani Aulika; 4.George Skivington ©; 5.Jebb Sinclair; 6.Ofisa Treviranus; 7.Blair Cowan; 8.Tom Guest; 9.Scott Steele; 10.Shane Geraghty; 11.James Short; 12.Eamonn Sheridan; 13.Tom Fowlie; 14.Topsy Ojo; 15.Andrew Fenby. Replacements: 16.Mike Mayhew; 17.Leo Halavatau; 18.Geoff Cross; 19.Sean Cox; 20.Kieran Low; 21.Darren Allinson; 22.Myles Dorrian; 23.Tom Homer.