Foam rolling injured hamstring?

Hello all :) I've injured my hamstring about two months ago during a too intense stretching session. I limped for about a week and a half afterwards. Now I don't feel my hamstring during my daily activities, but I do feel it when I stretch, so I try to work gently with it. I wanted to know whether it is OK to foam roll the muscle before stretching it, or it could aggravate the injury at this stage.