Lewis Stevenson has been ruled out for 4-6 weeks after picking up a knee injury in Friday's win over Edinburgh, while Stephen Ferris will report to the Ireland medical staff for the treatment and management of his ankle injury.
The second row limped off in the 39th minute after suffering medial ligament damage but the in-form forward may return in time for Ulster's Heineken Cup double header against Northampton next month.
Ulster currently have Neil McComb as their only fit lock; captain Johann Muller is sidelined with a thumb injury, while Dan Tuohy and Iain Henderson are training with the Ireland squad ahead of the Autumn Internationals.
Ireland back row Stephen Ferris followed Stevenson off the pitch early in the second half with an ankle injury. He will report to the Ireland medical staff for treatment and management.
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