The wing-back is on a two-year loan from Juve, but is keen to return.
“Lately there are situations where the players make the decisions with those who are around them," Gasperini told reporters.
“Spinazzola knows what I think and I am disappointed with him. In football it can happen that a Coach makes plans, but then it's up to the club.
“In any case, this was an eventuality that we had predicted. We had a good pre-season thanks to a group that worked really hard.
“In Serie A it's important to pick up points straight away, so the opening round is just as important as the final one. So far we've been solid, but for the Europa League we'll need a lot more and I am not kidding myself."