Playing in the same team as Lionel Messi is too stressful for some players because of the Barcelona star's ambition, Juan Carlos Unzue says.
Messi upset the Catalan giants in the summer when he declared his desire to leave, citing the club's failure to compete for the Champions League as a major factor in his decision.
The Argentina international has been a first-team regular for Barca for almost 15 years and remains the dominant force at Camp Nou.