The Dutch international winger penned a five-year contract with the Italian giants that runs until 30 June 2023.
Hafeez underwent corrective measures and was cleared to bowl following another assessment this May.
Froome was found to have twice the permissible amount of asthma drug Salbutamol in his system during September's Vuelta a Espana.
Semenya, CAS said, sought a "ruling from CAS to declare such regulations unlawful and to prevent them from being brought into force. An arbitration procedure has been opened".
The Australian said he was aware of the stories linking him to other teams, but did not confirm or deny any of the quoted figures attributed to key source Red Bull motorsport advisor Helmut Marko.
Jimmy Connors is on top of the elite 800-win group with 1,256 wins ahead of Roger Federer, who has 1,156.