Visagie injured his ankle on Friday night during the 15-6 win over Griquas and hobbled off the field. After seeing a specialist on Monday afternoon it was confirmed he would be out for between three and four weeks.
Cook, who broke his thumb, will be out of action for six weeks while Kirsten, who withdrew from the side late last week before the Griquas game, has an ankle injury and will be out for a fortnight.
Akona Ndungane, who has been struggling with a hamstring strain, said on Monday he still felt the effects of it, and a decision would be taken after Monday’s practice whether or not he would return to the team this week, but in all likelihood he will only be back next week.
While flanker Jacques du Plessis is struggling with a hip pointer, the Bulls were planning to rest him this week, although without Cook that might have changed now.
Either way, two of the Kings’ acquisitions – Bandise Maku and Jacques Engelbrecht – could be part of the match-22 on Saturday against the MTN Lions as replacements for the injured Visagie and Cook respectively.
Both have joined the Bulls from the Kings after Super Rugby and should be ready to play this weekend after training with the side on Monday morning.
Tony Jantjies (back), Jono Ross (contusion shoulder), Rudy Paige (shoulder), Waylon Murray (neck) and Francois Venter (mouth) will only train on Tuesday, but all should be available to play.