Director of Rugby Mike Ruddock has now revealed that Benjamin has suffered a fractured fibula to his left leg - the second time in his career after suffering the same injury at the Middlesex Sevens in August 2006 - and faces a spell on the sidelines.
"To add to a disappointing night we suffered a bad injury to Miles Benjamin," said Ruddock.
"Losing Miles is the most disappointing thing about the defeat in France. He has a fracture to his leg and could see the surgeon in the coming days. He is looking at 12 weeks out of the game.
"It is very disappointing for Miles, particularly when he suffered a similar injury to this only a few years ago at Twickenham. Hopefully he will get back without any further complications and we wish him a speedy recovery.
"We already have Chris Latham, Marcel Garvey, Matthew Jones, Ryan Powell and Chris Pennell out, to add to Sam Tuitupou away for this game. Suddenly there is a very different look to the starting line-up and backs that won such a crucial game up at Sale Sharks but we need to pick ourselves up and respond next week against Bourgoin."