 A final format, with the initial stages modified slightly from 2010, was announced in March 2011.Qualification began with two sets of two-leg knock-out qualification rounds – the first held on 29 June and 2 July and 3 July 2011 and the second on 23 and 28 July – reducing the number of teams in the main draw to 20.As in the 2010 format, the third stage consisted of 5 groups of 4 teams (with matches held between September 2011 and February 2012) with the top 2 in each group advancing to 2 groups of 5 that will play a further group stage during 2012 and 2013.