Ulster skipper Johann Muller out for month with groin injury Venue: Scotstoun Stadium Date: Friday, 22 February Kick-off: 19:35 GMT Coverage: Live on BBC2 Northern Ireland and BBC Sport website Ulster are expected to be without their skipper Johann Muller for a month because of a groin injury sustained in the Pro12 game against Zebre. Muller has a muscle tear and his absence will be a further blow to an already depleted Ulster squad. Injuries and international call-ups have tested coach Mark Anscombe's resources and he has used 46 players in competitive game this season. Several young prospects are in the squad for the Pro12 match in Glasgow. Academy players Alan O'Connor, James Simpson and Conor Joyce have been included, as have front row prospects Ricky Lutton and Andrew Warwick. Half-backs Paul Marshall and Niall O'Connor have also been named after missing the win over Zebre. Winger Neil Walsh, a late replacement in that game, may get another opportunity this Friday against the Scottish outfit. Ulster, top of the Pro12 table, have a seven-point advantage over second-place Glasgow ahead of Friday's game. Glasgow ran in eight tries as they won 60-3 away to the Dragons last week. Ulster squad - forwards: R Herring, N Brady, R Lutton, C Black, A Warwick, J Afoa, N McComb, A O'Connor, J Simpson, D Tuohy, M McComish, C Joyce, A Birch, R Diack. Backs: R Pienaar, P Marshall, M Heaney, N O'Connor, S Olding, P Wallace, M Allen, A Trimble, C Cochrane, N Walsh, R Andrew.