mahon then signed for queens park rangers ahead of the 2008–09 season, following a successful loan spell the previous season. injuries hampered the latter stages of his qpr career, and he was briefly loaned out to crystal palace in march 2011, although he did not make any appearances for the club. mahon signed for notts county on a free transfer in august 2011. he was loaned to stevenage in february 2013, for the remainder of the 2012–13 campaign. mahon left notts county at the end of the season, and briefly joined portsmouth in october 2013 for a one-month spell. he signed for tamworth in december 2013, playing for the club for the rest of the 2013–14 season in what was the final playing role of his football career.