Ó hAilpín began his third year again on the rookie list in 2007, which had to be his final rookie-listed season by AFL rules, playing exclusively in the Bullants' seniors and predominately in the ruck. He was believed to be close to elevation and selection, with Carlton coach Denis Pagan confirming this in a post-match press conference in June, but shortly afterwards Ó hAilpín sustained a season-ending groin injury. Carlton announced during the 2007 season that they would elevate Ó hAilpín to the senior list for 2008 and later made it official during the post season. After promising so much potential, Ó hAilpín failed to register a senior game and was delisted at the end of the 2008 season and left Australia.