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.
Wales Head Coach Rob Howley talks to WRU TV's Sebastian Barrett about the 36-man squad he has just named for the forthcoming Under Armour series, which includes two uncapped players, Ospreys duo Sam Davies and Rory Thornton.
Head coach Rowland Phillips is deligthed he can now call BT Sport Cardiff Arms Park home for his Wales Women's side, who launch their international season next month with games against Scotland and UK Armed Forces in the heart of the capital city.
Wales Sevens star Sam Cross has put his home town club of Brynmawr on the map after winning a silver medal at the Rio Olympics with Team GB. His club have now honoured him by naming their players bar after him, as WRU TV discovered at the official launch, recently.
One of the newest members of the Principality Premiership, Bargoed admit it's proving to be a steep learning curve at the highest level, but are determined to become a force to be reckoned with. WRU TV visited the club last weekend when they took on Llanelli.
Table-topping Aberavon travel to north Wales to tackle RGC 1404 as both teams defend unbeaten starts to the season in the Principality Premiership. WRU TV's Graeme Gillespie visited the Wizards to see how their preparations were going for the game of the weekend.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.