Wing Travis Ismaiel has been ruled out for up to eight weeks due to a suspected medial collateral ligament tear in his knee.
Ismael is believed to have suffered a grade three MCL tear during the Bulls' 62-24 defeat against the Crusaders on Saturday.
He will undergo further scans to determine the extent of the injury and the specific time frame needed for his recovery.
Meanwhile, Arno Botha, John Jackson and Ruan Steenkamp have overcome their respective injuries and will be available for selection for the Bulls' match against the Highlanders on Saturday.
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