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Cape Town - Wales fullback Liam Williams may require surgery and is a major doubt for the Six Nations opener against Scotland on February 3.
Williams tore his groin ligaments in a November 18
international clash against Georgia. Saracens had rehabbed him extensively for
the injury, opting against taking the surgical route.
But the 26-year-old has felt very sore since making his comeback for Saracens in last fortnight's 15-15 Champions Cup draw with Ospreys.
And now, according to Gatland, the Wales medical team will treat him over the next few weeks and make a decision on whether they want to undergo surgery.
"He is being rehabbed extensively over the next couple of weeks," Gatland told the BBC.
"Hopefully they can get him right but if he's not right unfortunately he might require surgery.
"It's probably an injury that six weeks ago he should have had an operation on it, but Saracens had rehabbed him and he's come away from the game against the Ospreys feeling very sore.
"Our medical team had a look and want to rehab him
extensively over next couple of weeks."
It adds to Wales' injury woes with news that flyhalf Dan Biggar would miss the first three rounds of the competition after he injured a shoulder in last weekend's European Champions Cup loss to Clermont Auvergne.
Meanwhile, fellow flyhalf Rhys Priestland, flank Dan Lydiate and lock Jake Ball will miss the entire tournament.
