He returned to play his final season for the Swansea Ospreys, before retiring from professional rugby in 2016, his usual position was number 8.

After a few frustrating seasons at Bath, he was named in the Welsh squad for the 2006 Six Nations Championship, and earned two caps during the tournament, making his debut against Scotland.

[7] In March 2010, Delve signed with the newly formed Melbourne Rebels,[8] and joined the team in October, in preparation for their inaugural 2011 Super Rugby season.

[10] In Round 9 of the 2011 season, Delve became the first overseas player to captain an Australian Super Rugby side (v. Highlanders, in Melbourne).

"[2] In May 2013, it was announced that Delve would leave the Rebels at the end of the season,[11] along with head coach Damien Hill and fellow Rebels players James O'Connor, Cooper Vuna, Ged Robinson, Nick Phipps, Nic Henderson, James King, Tim Davidson and Richard Kingi.

His last game as a Rebels player was a home game against New Zealand franchise the Highlanders, a match that also turned out to be the last Rebels match for head coach Damien Hill and players James O'Connor, Cooper Vuna, Ged Robinson, Nick Phipps and Nic Henderson.

[19] When asked to describe some of his proudest moments, he replied that one was when "I [gave] my match jersey to my grandfather before he passed away so that was absolutely massive for me and something I'll always remember.

"[20] Late in 2010, while house hunting in Melbourne with his partner, Delve chanced upon a man allegedly assaulting a woman and attempting to push her into a car.