Flip van der Merwe has been ruled out of a possible return to the Vodacom Blue Bulls team ahead of their Absa Currie Cup match against the Toyota Free State Cheetahs in Bloemfontein on Saturday.
The Springbok lock, who missed last Saturday's test match through suspension, has a knee injury and will be out of action for at least a week, team doctor Org Strauss confirmed.
Another Springbok, JJ Engelbrecht, has bruised ribs, but should be back on the field Tuesday.
Francois Venter (shoulder) will train Wednesday.
Mornè Mellett (neck, four weeks) and Callie Visagie (ankle, sevens weeks) has been confirmed as no-starters for the rest of the Currie Cup campaign.