Glasgow received a boost ahead of their Heineken Cup clash against Leinster when Rob Harley was cleared to play following a disciplinary hearing.
The 21-year-old was the subject of a RaboDirect PRO12 tribunal after picking up his third yellow card of the season against Scarlets on Saturday. But the disciplinary committee imposed no suspension after listening to the player's explanation.
Head coach Sean Lineen said: "It's great to have the matter settled, and a real boost to the team to know that Rob will be involved. He's been a key player for us all season and we're expecting another big performance from him."
Harley will line up at openside flanker in a team showing 10 changes following the narrow defeat in Wales.
The Warriors enter their penultimate match in Heineken Cup pool three trailing Leinster by six points in the standings and are seeking to inflict the defending champions' first loss in European competition since December 2010.
Lineen knows Glasgow must deliver to keep alive their hopes of advancing in Europe this term after earlier wins over Bath and Montpellier.
He told www.glasgowwarriors.org: "This is the sort of game you work in rugby to be involved in. What a challenge we've got ahead of us, against a side who have set new standards for the rest of Europe in what they do at the contact area and how many good decisions they make right across the park.
"We know from the first game back in November that it's going to be tough, massively so, but this is what it's all about."