O'Shea, who was capped 35 times by Ireland, is now approaching the start of his third season with Harlequins having joined in March 2010. "I am delighted to have re-signed with the club." O'Shea commented. "This is an exciting time to be part of Harlequins. Our talented squad is developing in the right direction and I cannot thank the players, coaching team and support staff enough for how they have made my role so enjoyable. Our aim is to continue to develop and play the game in the way we believe it should be and to bring the success to the supporters that they deserve."
Having qualified for this season's Amlin Challenge Cup quarter-finals, Harlequins will set out to defend the title they won in such dramatic fashion at Cardiff City Stadium in 2011 with a clash in the last eight against Toulon at Stade Félix Mayol on Friday, 6 April next.
Commenting on the re-signings, Harlequins' Chief Executive, David Ellis said: "I am delighted that Conor, John and Collin have renewed their contracts with Harlequins. All three provide a wealth of knowledge and experience for the club. I, like all our supporters, look forward to seeing our squad continue to grow and develop under the expert guidance of our talented coaching staff."