Cokanasiga left the field in the Blue, Black and White’s friendly against Cardiff Rugby after damaging his knee while Spencer started the opening day of the season at Sale Sharks and injured his hamstring.
Both players will work with the club’s expert Performance Department who will ensure they are given the best rehabilitation possible for the quickest and safest return to action.
“Our main priority is to give both players our full care and support,” Director of Rugby Stuart Hooper said.
“We are bitterly disappointed for Joe after his recent history with injuries. He showcased exactly what he was about in the summer with England and we are confident our Performance Department will help him reach the highest level once again.
“Ben has been a key part of our side since his arrival at the club and he will give everything to his rehabilitation just as he does with his training.”