Sir Alex Ferguson said Jose Mourinho made a big mistake by going back to Chelsea for the second time

Sir Alex Ferguson said Jose Mourinho made a big mistake by going back to Chelsea for the second time.Ferguson, who won 13 Premier League titles in an unprecedented 27-year spell at Old Trafford, believes Mourinho has the right tools to succeed.

United have struggled since Ferguson retired in 2013, finishing in the top four just once in three seasons under David Moyes then Louis van Gaal.

Mourinho returned to Chelsea that summer and won the Premier League title in his second season – the first for the Blues in five years.