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Former All Blacks fly-half Nick Evans could miss the rest of Harlequins' regular Aviva Premiership season with a serious leg injury.
Harlequins boss Conor O'Shea revealed Evans may miss three months if damage to a bone in his right leg can only be repaired by an operation.
The 35-year-old suffered the problem in Harlequins' 28-6 league defeat at Gloucester on Saturday, and must now wait to discover the extent of the damage.
"He's seeing a specialist and he'll be out for a minimum of six to seven weeks," said Harlequins rugby director O'Shea.
"He's pulled a bit of bone off the leg, it's just whether, with the damage he's done, it will need to be looked at for an operation.
"If anything happens it would be around 12 weeks.
"You see it happen a lot unfortunately. We just wish him luck."
Harlequins sit fifth in the Premiership table and face a European Challenge Cup quarter-final against London Irish on Saturday, April 9.
O'Shea said Evans would be likely to miss the remainder of Harlequins' regular-season Premiership clashes if he requires any kind of operation to fix his injury.
The pinpoint goal-kicker would then be in a fight to be fit for a potential Challenge Cup final, on Friday May 13, and the Premiership play-offs, with the semi-finals set for the weekend of May 20 to 22.
"If it does end up 12 weeks that would would bring him up to the final of the Challenge Cup," said O'Shea.
"Ben (Botica) will get a chance to run the show, and we have Tim Swiel too who played a lot of rugby for us last year."
Harlequins had been tipped as one of the clubs chasing the services of England fly-half Danny Cipriani for next season.
Wasps have confirmed their capture of the 28-year-old, who will leave Sale this summer and return to his former club.
O'Shea admitted he had expected Cipriani to return to Wasps.
"We get a lot of people across our desk, and you talk to a lot of people, but it wasn't a surprise that he went to Wasps," said O'Shea.