| Jones, who has been contesting the Wales loose-head berth with Gethin Jenkins, suffered the injury in the Ospreys' Heineken Cup loss in Munster.
"It's a big blow for Wales and it's a big blow for the Ospreys as well," Ospreys Coach Lyn Jones said. "With a bit of luck the time he's out will be six weeks, rather then the six-to-eight we had feared."
Wales lock Brent Cockbain is also struggling to make the Ospreys' final Heineken Cup match against Castres after suffering a dead leg against Munster. Young fly-half Matthew Jones sustained a head injury in the same game and may also miss out.
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