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.'
Welsh players and management joined Deputy Minister for Sport Ken Skates at the Pierhead Building, Cardiff Bay earlier this week to reveal the Union's pioneering school-club hub initiative has been so successful the project will now almost double the scale of the original project.
The Scarlets, Newport Gwent Dragons, Cardiff Blues and the Ospreys look ahead to Judgement Day III which sees the Blues take on the Ospreys (2.30) and the Dragons tackle the Scarlets (4.45pm) at the Millennium Stadium tomorrow afternoon.
Ystradgynlais and Ynysddu played out a titanic struggle at Taffs Well in the SSE SWALEC Bowl semi-final. At the end of the game neither team could be separated after a 15-15 stalemate but Ystradgynlais go through on try count.
Blues strike first in JD III battle - Newport Gwent Dragons lock Andrew Coombs, WRU referee Dylan Llyr Jones and Cardiff Blues hooker Matthew Rees decide dressing room allocations for Judgement Day III
Wales Under 18 captain Calum Haggett has received a conditional offer to read Biomedical Science at St Anne's College, Oxford. WRU chairman Gareth Davies went to meet Calum and Coleg y Cymoedd Principal Judith Evans to wish him luck in his exams and pass on some of his personal experience.
Dodgy tattoos, carthorses, Avatar and soft chins are revealed by Wales Sevens players Tom Williams and Sam Cross as they profile the Wales Sevens squad taking part in Hong Kong this weekend in the latest round of the HSBC Sevens World Series.