Bentley was left out of the squad for the friendly at Moss Rose because he has a calf injury, according to manager Paul Ince.
"He would have played here tonight if he had not been injured, but I know that in football players come and players go," Ince said.
"We have had an offer from Aston Villa, but I do not want him to go.
"But he is injured and he will have a couple of days off and I hope to take him to Germany on Wednesday for our training trip."