The Bulls have agreed a deal to sign second row Paul Willemse from the Lions.
Willemse, who played a key role in South Africa's success at the IRB Junior World Championship, will team up with the Bulls on November 1.
"He is clearly enjoying his rugby at the moment and one can see that in his efforts on the field," head coach Frans Ludeke told the club's official site.
"He is a big, strong man and loves the physical aspects of being a lock, something that should fit in perfectly at the Vodacom Bulls. We are delighted to get him on board and I believe he will do very well with us."