Uncertainty over Robshaw
Uncertainty over RobshawSHARE
The 30-year-old suffered the injury midway through the first half of his side's Premiership clash against Worcester Warriors at Sixways on New Year's Day and was eventually taken off at the interval.
Consequently, Robshaw has missed England's two-day training and will not partake in Harlequins' match against Sale Sharks on Saturday.
The uncertainty is really problematic for England's preparation ahead of the Six Nations.
Robshaw will see a specialist early next week to determine the best course of action for his recovery; either an extended period of rest and rehabilitation, or an operation.
An operation could see the England flank miss the Six Nations.
England start their Six Nations title defence by hosting France at Twickenham on February 4.