Calderon reckons Mourinho ignores his players.
"The players are no longer happy. He [Mourinho] hasn't spoken to Kaka once in the last four months," Calderon said to Ona FM.
"The Spanish players are unhappy with their situation because of the privileges Mourinho gives to the Portuguese players.
"And then there's the situation of Sahin. The reason he doesn't play is because Mourinho doesn't like him."