"It is up to the medical staff to say no," said Robson.
"You are risking the rest of your career if you have a pin in a bone and go back too early and you shatter the bone. That could end your career and we don't want that."
He said: "
"He has a great attitude to football and will want to play. Everyone has to be patient.
"Not being able to run for six or seven weeks is going to take the edge off his game, but fingers crossed I hope he gets there."