That's not a serious injury at all then, if it's just a deep muscle bruise.
Pereyra didn't get called up for Argentina because he was injured last week against Sevilla? Or so I thought.
Edit. Apparently I was wrong and Pereyra did get called up and injured. FFS, he was just recovering from his injury against Sevilla that made him miss Bologna on the weekend. The club should have refused to release him.