 On 5 August 2010 it was announced that Mooney would be joining League One side Colchester United on loan until 3 January 2011.He came on as a substitute in the U's first league game of the season, a 2–2 draw at Exeter City.Mooney then scored twice on his full debut for the club, with a pair of first half goals in a 3–0 League Cup win over Hereford United.