"He has to stop to take the time it takes and he needs that explosiveness in order to stand out," Fabregas told reporters at a press conference.
"Something similar happened to me and I was very frustrated. You believe you are okay, but you are not. I was angry to miss some games, but I knew I was at Barcelona and I could continue to grow.
"I had that injury, I had a nightmare and even for a year-and-a-half was not good. He has to stop as it takes time, because if not, it will not heal well."
Fabregas netted twice in Sunday's win in Seville.