Joe Cole has suggested that Pep Guardiola has made a big mistake at Manchester City. After getting knocked out of the Champions League by Real Madrid last night, the Blues have another big game ahead of them this weekend. On Saturday, City will be in action at Wembley Stadium, taking on Chelsea in the semi-final of the FA Cup. Looking ahead to this game, one pundit and former Chelsea player has claimed that Guardiola may have made a rare mistake that could cost his side in the upcoming showdown. Cole says Guardiola may have made a big mistakeREAD MORE: Man City squad numbers for the 2023/24 se…