Jenkins face race against time to be fit in time for Wales Six Nations opener
Wales prop Gethin Jenkins faces a race against time to make Wales' RBS 6 Nations opener against Ireland in Dublin.
Jenkins went off six minutes before half-time as Cardiff Blues reached the Heineken Cup quarter-finals with a 36-30 Pool Two home victory over Racing Metro.
Wales begin their Six Nations campaign against Ireland in Dublin two weeks' today.
Injury doubt: Gethin Jenkins looks dejected as he sits on the bench with an ice pack on his knee
'It is very early to say,' Blues backs coach Gareth Baber said, when asked about former Wales captain Jenkins' injury.
'Over the next 24 to 48 hours we will get more information. I think he has tweaked a ligament in his knee.
'I am not sure what 'tweaked' means, to be quite honest with you, whether it means he is just hurting a little bit and it will sort itself out, or anything further.'
Wales coach Warren Gatland has already lost Jenkins' fellow forwards Luke Charteris, Alun-Wyn Jones and Lloyd Burns from the tournament, while fly-half Rhys Priestland and flanker Dan Lydiate both suffered injuries during Saturday's European action.
Blues centre Jamie Roberts, meanwhile, has not played since suffering a knee injury two days before Christmas, so there is plenty for Gatland to take stock of as his 35-man squad head for a Six Nations training camp in Poland this week.
Cause for concern: Warren Gatland has a number of injury concerns ahead of the start of the Six Nations
Despite Jenkins' early exit, the Blues secured a last-eight berth – albeit away against Heineken Cup holders Leinster – thanks to wing Alex Cuthbert's try double, a Lloyd Williams touchdown and 21 points from full-back Leigh Halfpenny, including five penalties.
Edinburgh's bonus point win against London Irish at Murrayfield, though, means the Blues qualify as best runners-up and not Pool Two top dogs, travelling to Dublin in early April.
Had the Blues scored a fourth try, they would have won the group and enjoyed the advantage of a home quarter-final.
Racing pushed them all the way, scoring tries through their former Exeter full-back Josh Matavesi and wing Sireli Bobo, with fly-half Jonathan Wisniewski kicking three penalties, centre Francois Steyn two and scrum-half Sebastien Descons a conversion and penalty.
Race against time: Jenkins will hope to pull on the famous red shirt during the tournament
'We are absolutely over the moon to be in the quarter-final of the European Cup,' Baber added.
'We targeted being in it, and we have fulfilled our target.
'This competition throughout the whole weekend has thrown up little scenarios. Hats off to Edinburgh, they got their four tries today. We scored three, and it was always going to be as close as that.
'We met a big, physical Racing side today who were on their mettle. We managed to score three tries, but we couldn't sneak a fourth.
'I think Racing wanted to sign off from this season's tournament by putting as much pressure as they could on us.
'When we take stock of what we have put together in this season's Heineken Cup, we lost one game (away to Edinburgh), and we got a bonus point out of that.
'We have got a character and ability about ourselves that manages to win games, and we are working hard as a group to make sure we develop our game.
'There is a huge amount of talent and experience in that changing room. Let's not forget we were one try away from taking the whole bag of what we needed.'