On 6 May 2010, it was announced that Plymouth were to look for a new manager, however Mariner would remain as a member of the coaching staff. Mariner's tenure as manager ended when Peter Reid was hired on 24 June 2010. Mariner stepped down from his role at Home Park on 30 December 2010 to pursue another opportunity. "I have known Paul for a long time and working with him has been fantastic," said Argyle manager Peter Reid. "I'm sure he will be successful in everything he does in the future. He's a great personality and someone who is a legend with the fans at this football club."