Following his release from the Stormers at the weekend, Siya Kolisi has put pen to paper on a deal with the Sharks.
SANZAAR chief executive Andy Marinos has described reports over potential alternatives to Super Rugby as "merely speculative."
South African Conference leaders the Sharks will not play again for an indefinite period due to the coronavirus but won on Saturday.
The Sharks moved top of the Super Rugby standings with a resounding win over the Jaguares, while the Bulls ended their wait for a victory.
The Hurricanes proved far too strong for the Sunwolves in Super Rugby on Saturday, while the Sharks beat the Reds.
Australian Conference rivals the Brumbies and the Reds enjoyed big wins on Saturday, the leaders recovering from an outbreak of mumps.
The Brumbies looked to be heading for victory following a Folau Fainga'a hat-trick, but they were unable to hold off the Highlanders.
Irae Simone set the ball rolling for the battling Brumbies in a fine win over the Rebels, while the Sharks dazzled against the Highlanders.
The Sharks ended a poor recent run against the Bulls with a 23-15 win over their South African rivals in Friday's Super Rugby clash.
Sale Sharks saw off a La Rochelle side who were let down by Pierre Bourgarit, as the English team sealed a first European win of the season.