Wales hooker Huw Bennett is set for a further spell on the sidelines, ruling him out of the autumn internationals.
Bennett has been told he will need another operation that could rule him out of action for up to six months.
The hooker left the Ospreys at the end of last season and signed a two-year contract with Lyon.
Wales start their autumn campaign against Argentina at the Millennium Stadium on 10 November.
Gatland, who has not led Wales since undergoing surgery on his broken heels, is set to be appointed British and Irish Lions coach in early September for the 2013 tour to Australia.