Ryan Jones face an anxious wait with his injury while Stephen Jones is expected to be back to full fitness next week.
Ryan Jones's dream of playing in a World Cup are hanging in the balance after a niggling calf injury could rule him out for up to two weeks.
The Ospreys No 8 injury woes have left the Wales management with a headache as head coach Warren Gatland could be forced into sending out for a replacement just after one game.
Gatland admitted he is left in a quandary and will have to assess the situation after Sunday's opening World Cup clash against defending champions South Africa in Wellington.
"The thing is if we do replace him and if he does recover in two weeks and we pick up another injury, you can't recall that player."
Jones missed selection in the Welsh squad for the 2003 World Cup and withdrew from the 2007 tournament with a shoulder injury.
"We just want to see how Sunday goes and hopefully we won't pick up any injuries and we've just got to give (Jones's') injury a little bit more time to settle," Gatland added.
"It's a long tournament and we've got to make sure we make the right decision there. Obviously, if we pick up injuries on Sunday that's going to change our thinking, so we have to see what happens."
Jones won selection in Wales' 30-man World Cup squad after convincing team medical staff of his fitness after playing only 30 minutes in three warm-up matches, missing wins in Cardiff over England and Argentina.
On the Welsh squad's arrival in New Zealand he had been confident of breaking his World Cup jinx.
"There is always the moment where you think 'oh no, not again'," Jones said. "You never know what will happen.
Playing at the World Cup is always something I have dreamed of doing and now I am really looking forward to it.
"The fact I have never been to a World Cup before means I have nothing to compare this to. But I want to experience one. I want to do my best for my team and my country," he added.
Gatland said prop Gethin Jenkins and flyhalf Stephen Jones, who were not considered for the South Africa match because of injuries, were expected to return to full training from next week.
The Welsh Rugby Union is forming a new Youth Board with a brief to help keep more young people involved in the game during their late teenage years and beyond. The first task of the fifteen strong Board will be to analyse and consider the issues which lead to a number of youngsters drifting away from the sport between the ages of 16 and 21. To apply visit www.wru.wales/youthboard
The Foster's Challenge Cup will involve the 12 Principality Premiership sides and will run during European and British & Irish Cup weeks, providing vital fixtures for the participating clubs and an opportunity for upcoming players to step up to semi-professional rugby and make a claim for starting places within the Premiership squads.
Eighty schools and colleges in Wales now have a full time rugby officer as part of the WRU's school club hub scheme. All of the school club hub officers recently gathered at the National Centre of Excellence for various workshops.
With Liam Williams forced out of the World Cup through injury, lock Luke Charteris and Skills Coach Neil Jenkins say they have to put yesterday's defeat behind them as Wales now look ahead to another physical encounter against South Africa in the quarter-finals of the Rugby World Cup.
WRU Consultant Head of Physical Performance Paul Stridgeon praises the Physical Performance department for their work and dedication as he addresses the media ahead of Wales' Pool A clash against Australia
Twelve young people have been selected to follow a one year WRU Coach Core apprenticeship programme. Coach Core was set up by the Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry as part of the Olympics legacy in 2012 and the Duke of Cambridge was on hand to meet the apprentices on their first day in the job. The programme has been funded by the Hunter Foundation.
The WRU has launched a campaign to create a long term legacy for Welsh club rugby by highlighting the advantages of volunteering. Rhian Edwards, a volunteer at Seven Sisters, has enjoyed many benefits of her volunteering at a grassroots rugby club including being part of the Rugby World Cup volunteer workforce after being nominated by the WRU - and the WRU is asking for more people to develop their 'Welsh rugby roots'.