Ulster will continue to assess Louis Ludik's knee injury after the full-back was forced off against Southern Kings last Saturday.
The Ulster Rugby medical team issued a squad update on Tuesday ahead of Saturday’s Heineken Champions Cup quarter-final against Leinster.
"Louis Ludik sustained a knee injury in the weekend win over Isuzu Southern Kings and he will continue to be assessed this week," Ulster said in a statement.
"Marty Moore sustained a concussion in the same match and will follow the return to play protocols.
"James Hume suffered a right ankle fracture in training last week, which has required surgery. He is expected to return in time for pre-season.
"Craig Gilroy and Will Addison remain unavailable for selection this week because of ongoing back injuries."
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