Loosehead prop BG Uys will join the Cheetahs from the EP Kings after this year's Currie Cup competition.
EP Kings coach Carlos Spencer says South African teams are guilty of not allowing players to express themselves.
The harassment of referees has forced the Eastern Province Rugby Union to cancel all club matches this weekend.
The EP Kings ran in 10 tries as they thrashed a Blue Bulls XV 66-28 at the Nelson Mandela Bay Stadium on Friday.
Luke Watson will captain the Eastern Province Kings when they tackle the Bulls in a friendly game on Friday.
James Hook scored 14 points in Wales' resounding 34-12 win over the Eastern Province Kings on Tuesday.
Wales kick off their tour of South Africa against the EP Kings at the Nelson Mandela Bay Stadium in PE on Tuesday night.
Warren Gatland has named three uncapped players for Wales' match against the Kings in Port Elizabeth.
Tobias Botes is one of three new signings for the Kings ahead of their Currie Cup Premier Division campaign.
Springbok prop CJ van der Linde will play for the EP Kings in this season's Currie Cup Premier Division.