Connacht's promising lock Andrew Browne (above) is likely to be out of action until March after suffering an ankle ligament injury.
The former Ireland U-19 and U-20 international will miss Saturday's final pool game against Olympus Madrid but should be back in plenty of time for the Amlin Challenge Cup quarter-final in April.
"It looks like he will be out for about six weeks but we will need to monitor it and get him sorted," said coach Michael Bradley.
Bradley will already be without scrum-half Frank Murphy for the trip to Madrid this weekend after he suffered a calf injury in the 20-10 win over Montpellier.
Browne, who will turn 23 on Thursday, will miss the Magners League game against Ospreys on February 21 and could also miss the home ties against Leinster and the Dragons, which were postponed recently, if they are refixed in that time frame.
"The most important thing at the moment is to concentrate on getting a result in Madrid on Saturday. There will be time after that to assess where we are," added Bradley.