Wales have injury problems at hooker for the 2025 Six Nations with captain Dewi Lake ruled out for up to three months.
The 25-year-old has had bicep surgery, with Ospreys head coach Mark Jones stating before Christmas the front rower would be out for "months rather than weeks".
Wales open their Six Nations campaign against France in Paris on 31 January and finish at home against England on 15 March.
Jones has now given a more accurate 12-week time frame which will rule Lake out of at least the first half of the tournament and probably the whole competition, unless he can beat the worst-case diagnosis.
"I think 12 weeks was the high end of it [time frame]," said Jones.
"We know the operation went well; there is nothing to suggest he can't beat that target.
"I know Dewi and the quality of the rehabilitation out there now. He has an awesome mindset and is a great professional.
"I texted him over Christmas and he is set on getting that [time frame] as low as he can."