"We're really disappointed for Taulupe -- he's been in great form this season, so it' s really unfortunate news," Bath director of rugby Todd Blackadder said.
"However, he's in great hands with the medical team and we look forward to having him back on the pitch soon."
Wales will definitely be without flanker Sam Warburton for the Six Nations, being held from Feb. 3 to Mar. 17, after the British and Irish Lions captain underwent knee surgery last week.
(Reporting by Aditi Prakash in Bengaluru)
