Former Arsenal defender Martin Keown believes Manchester United's treble-winning season was 'more of an achievement' than that of Manchester City due to the quality of their title rivals.
City secured a historic treble on Saturday after beating Inter Milan 1-0 in the Champions League final. The Blues pipped their Manchester rivals to the FA Cup just seven days prior and brought the Premier League back to the Etihad for a third straight season.
It is only the second time in English football history that a team has won all three trophies, with Sir Alex Ferguson's United having done to back in 1999.