Ospreys trio Huw Bennett, Andy Lloyd and Luke Tait will all miss the start of the Celtic League campaign against Munster this weekend.
Wales hooker Bennett, who toured Argentina and South Africa in the summer, is suffering a hernia and could also miss the west Wales derby against Llanelli a week later.
Flanker Lloyd is also out for a fortnight with a hamstring problem while coach Lyn Jones is also keeping a close eye on lock Tait's neck strain.
'It's a blow but we have brought in a number of high-quality players to strength in depth to the the squad,' said Jones.
Meanwhile the Ospreys are considering a change in team name and playing colours for next season as they quiz supporters from Neath and Swansea over the future of the regional team.
Ospreys chief executive Andrew Donald said: 'The consultation will be exactly that - a listening exercise. We want to know from supporters what they think we've got right and where we could do better. We'll want to know what they think of the Ospreys' identity and branding, as well as obtain feedback on the Ospreys' future facilities.'
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'.
Wales head coach Warren Gatland and captain Sam Warburton say their first prioirty on Sunday in the opening game of the World Cup is to win against Uruguay and not get overly concerned with points difference.
With only days to go until the biggest rugby competition in the world begins, rugby fans visiting Cardiff this autumn will be able to enjoy a special display at National Museum Cardiff as part of the celebrations surrounding the Rugby World Cup.