The Ospreys are sweating on the fitness of star duo Ashley Beck and Justin Tipuric ahead of the crunch Heineken Cup clash with Leicester Tigers.
The Swansea-based region must maul the Tigers to keep their European hopes alive but could be without the international pair.
Beck is unlikely to recover from an ankle injury in time and Tipuric's chances are rated at 50/50.
"Tips is doing some rehab and is 50-50, but we are waiting on some extra information on Ashley Beck, who is a real doubt," said Ospreys head coach Steve Tandy.
"Tips has been huge for us, Becky, too. It something we've had to get used to this season, with senior players missing, people like Ian Evans, Alun Wyn Jones, Aaron Jarvis and Hanno Dirksen.
"If we lose Beck and Tips it will be a huge task for us, especially given the limited squad we have. But it's something we have to prepare for and we are going to give it a right old go."
Tandy was more hopeful of having Tipuric available for selection but he insists he will take no risks despite the magnitude of the game.
"There's always that temptation but we won't put the group before the player," said Tandy.
"If he's not right, he's not right. There are educated risks in what we are doing, but I need to sit down with the physio and see where they are come Friday.
Tom Issacs is set to fill the void left by Beck and Sam Lewis is a front-runner to start if Tipuric fails to recover.
And Tandy insists the Ospreys are confident of the duo coming in and producing the goods.
"We have no issues with TI (Isaacs) starting at 13 this weekend. He did really well for us there against the Scarlets earlier in the season.
"We'll weigh things up in the back-row, but we have a boy in Sam who's outstanding every time he wears the shirt.
"He was out on his feet at the end of the Zebre game, especially after his performance against the Dragons. He is developing all the time.
"You find out more about people on these big occasions and we are keen to develop from within. I know if Sam has to step into the role he won't let us down."
The Webb Ellis Cup visited Lampeter on Monday to recognise the fact that the town is celebrating a major milestone as it is believed the first ever game of rugby played in Wales, was in fact played in Lampeter 150 years ago.
Cardiff Blues U18 Girls will go into Sunday's Gemau Cymru with an extra spring in their step after Welsh internationals Elinor Snowsill and Philippa Tuttiett offered some last minute tips at a training session earlier this week.
Rob Howley and Josh Lewsey addressed more than 250 community club coaches and referees at the first WRU National Community Conference on the weekend. The volunteers benefitted from coaching masterclasses and workshops in a bid to connect all levels of the rugby pathway in Wales.
UEFA has today confirmed the Football Association of Wales (FAW) has been successful in its bid for the Millennium Stadium to host the 2017 UEFA Champions League Final on Saturday 3rd June, 2017 (kick-off: 19.45hrs GMT).
The winners of a filmmaking competition organised by the education charity Into Film and the WRU enjoyed a behind the scenes tour of the Millennium Stadium - and a chance to be photographed with the WRU's fire-breathing, rugby loving mascot, Scorch The Dragon, and Welsh international, Jake Ball.