Wales prop Adam Jones looks set to miss the Ospreys' Heineken Cup double-header against Toulouse next month.
Jones was ruled out of Wales' current autumn Test campaign due to a knee injury.
And while his rehabilitation is going according to plan, it appears unlikely that he will play again before Christmas.
With Jones sidelined, his Ospreys front-row colleague Aaron Jarvis made an impressive Test debut against Argentina last weekend and will start on Friday night when Wales face Samoa at the Millennium Stadium.
Ospreys physiotherapist Chris Towers said: "Although Adam remains unavailable due to the knee injury he re-aggravated in the Leicester match (last month), we are happy with the progress he is making in his rehab.
"In line with the initial rehab plan, he still requires a further six weeks to get him back to the condition required to reach a position where he will be able to return to playing."
The Ospreys were dealt another major injury blow earlier this week when their Wales lock Alun-Wyn Jones suffered a serious shoulder problem.
Jones damaged his shoulder during the 26-12 Pumas defeat and was due to undergo surgery this week.
He faces a lay-off of 12 to 16 weeks, meaning he is likely to sit out at least part of Wales' RBS 6 Nations title defence, which starts against Ireland in Cardiff on February 2.