And he has been a regular in their teams mostly based on defensive solidarity.
He has been found wanting everytime Abrahamovic has insisted on them playing a more attacking game. Did you watch Chelsea last season? I am not saying Mikel was the reason they were poor, they were poor because AVB insisted on playing a style that wasn't suited to the attacking players they had. They have far better attackers now, but they are more open and Mikel in my opinion is a weak link.