Duncan Jones has made 114 appearances for the Ospreys
Ospreys and Wales prop Duncan Jones has suffered a setback in his recovery from a right foot injury and will be out for about another six months.
Loose-head Jones picked up the injury in a December league win over Munster, and after coming out of plaster it was decided that he needed more surgery.
Ospreys tight-head prop Ross Davies is also out for the season (ankle injury).
Meanwhile, Neath and ex-Wales full-back Kevin Morgan has taken on an assistant conditioning coach job at the Ospreys.
The 32-year-old will combine the role with playing and performing the conditioning coach role at the Welsh All Blacks.
"I'm extremely grateful to the Ospreys for giving me this opportunity," said 2005 Grand Slam winner Morgan. "Hopefully this will allow me to develop and grow as a coach."
The Jones news will be a blow for Wales and the Ospreys, for whom he has made 114 appearances.
The 31-year-old has established himself as a regular in the national squad since making his Wales debut against Australia in 2001, with 57 caps to his credit.
"Duncan has suffered a few complications with his recovery and the damaged bone in his foot failed to unite during the period he was in plaster," said Ospreys physio Chris Towers.
"We've been investigating this and seeking expert opinion over the last fortnight, as a result of which Duncan will be having surgery over the next week to hopefully fix the problem.
"At this stage we expect that this will keep him out for around six months."