Munir, on-loan with Alaves, was capped by Spain with Del Bosque in charge. But he now hopes to declare himself for Morocco.
"We did what we had to do with Munir," said Del Bosque.
"But I think we have to be flexible in life and for 15 minutes they should let him play.
"I feel guilty, we called him up. He was in the sub-21 and one of our players got injured. I would like for him to go with Morocco."