Mourinho does not agree with Gareth Southgate's decision, as he believes that Sterling's form did not warrant a starting place.
"I was a little bit surprised that Sterling was in the team," he told Russia Today. "He did not have a good World Cup.
"He didn't have a good enough World Cup to be chosen for a match ahead of [Jamie] Vardy, [Danny] Welbeck, [Marcus] Rashford – people with probably better condition from a physical and psychological point of view."
Sterling failed to score in his six World Cup starts, while his only assist came in the 6-1 win over Panama during the group stage.