In January 2013 he agreed to join Wasps for the 2013–14 season.[6]
In January 2019 Mullen retired from rugby citing a lack of motivation after a long spell out with injury.[7]
International career
Mullan represented the England under-20s during their 2007 Six Nations campaign.[8] and was selected for the England Saxons against Ireland A in April 2009, though the game was cancelled due to poor weather conditions.[9]
Mullan did not tour in the summer of 2009 due to a shoulder injury,[9] whilst a torn hamstring thwarted a possible Senior debut in the 2009 Autumn Internationals.[10]