 The proposed format, announced on 16 May 2011, began in November 2011 with the first round of 12 two-legged knock-out ties.The ties, involving the 24 lowest-ranked teams according to FIFA World Rankings, were drawn in Brazil on 30 July 2011.The 12 winners joined the remaining 28 CAF entrants in the second round, which consists of 10 groups of 4.