Squad news:Ulster coach Mark McCall has brought in Adam Larkin as cover for the injured David Humphreys as he named a 23-man squad ahead of the province's Magners League game against Glasgow on Saturday.
Humphreys is not included in the squad as he hurt his left arm in the first few minutes of last Sunday's defeat away to Leinster at Lansdowne Road.
An MRI scan revealed a degree of bony bruising from the impact and significant soft tissue damage. However, with intensive treatment and rehabilitation there is an outside chance he could be fit for the away Magners League trip to the Ospreys at the end of January.
McCall's men will be hoping for a win to extend the lead at the top of the table. Glasgow have won six of their last nine games. McCall will name his team on Friday at noon.
Ulster squad
Backs: Kieran Campbell; Isaac Boss; Adam Larkin; Paddy Wallace; Kevin Maggs; Paul Steinmetz; Andrew Trimble: Paul McKenzie; Mark Bartholomeusz; Bryn Cunningham; Tommy Bowe
Forwards: Simon Best (C); Bryan Young; Justin Fitzpatrick; Rory Best; Paul Shields; Justin Harrison; Matt McCullough; Tim Barker; Roger Wilson; Neil Best; Kieron Dawson; Neil McMillan
:quality(70)/cloudfront-eu-central-1.images.arcpublishing.com/irishtimes/IMNWKIX5DFFCFE5CD5NLBU6EVY.png)