"We have received the all-clear from Calvin's surgeon for him to start playing again," said assistant boss Mick Jones. "It really has been a remarkable comeback because he is way ahead of schedule.
"The surgeon has done a magnificent job on it but Calvin has worked so hard during his rehabilitation. I am absolutely delighted for Calvin. The injury was potentially career threatening but I have never seen a player work as hard as him.
"Hopefully by the time the international break is over we will have another player to choose from."