James O'Connor will make his London Irish debut against Aviva Premiership rivals Northampton at the Madejski Stadium on Sunday.

The Exiles, who announced Australian star O'Connor's arrival earlier this week, have handed him the number 15 shirt for his first Premiership start.

He will be joined in the back-three by Topsy Ojo and Sailosi Tagicakibau in a team captained by scrum-half Tomas O'Leary.

O'Connor's contract with the Australian Rugby Union was torn up after his alleged drunken behaviour at Perth Airport earlier this year.

He has joined London Irish until the end of this season.

"It has been a big week for the club with the announcement of James O'Connor, and we hope we see a big turn-out by our supporters on Sunday to welcome him to the club," said Irish rugby director Brian Smith.