Beattie's international career has stalled in the last 18 months as Simon Taylor, Ally Hogg and Dave Callam have worn the No.8 shirt.

Brown, too, has suffered a disappointing Autumn having been an integral part of the RBS 6 Nations squad.

Barclay, however, is a firm fixture in Frank Hadden's plans and Greenwood believes he was the star performer against Bath, for whom England open side flanker Michael Lipman was in their back row.

The former Harlequins player said: "I felt Glasgow dominated at the breakdown and all three of their guys played well.

"John Barclay in particular was outstanding. Every time you felt Bath might steal the ball he was there to secure it for his team."