Quote: DGM "I'm not sure as to the legalities of this, but I wonder if SL clubs have the ability to add a condition into all future player contracts that stipulates the player cannot move to another sport whilst they're still under contract? Basically meaning a player can't "retire" then pop up in union a week later.'"
This is a fairly standard clause in professional sports contracts.
For example, below in a rugby union contract
[i6 PLAYER’S OBLIGATIONS
The Player shall throughout the Term of this Agreement as set out in Schedule 1
Source, The RFU website, standard premiership rugby contract.
They governance of their sport openly allow for a clause like this to be entered into a contract. It would be difficult for them to argue that it is unenforceable if a similar clause is in Solomona's contract with Cas.