What can a player not do if he signs a contract with a CFL team during the CFL season?

When a player signs a contract with a Canadian Football League (CFL) team during the CFL season, he is bound by that contract, which includes restrictions on playing for other professional teams concurrently. Specifically, if a player is under contract with a CFL team, he cannot play for an NFL team in the same season due to the professional exclusive rights granted to CFL teams.

The contract typically includes clauses that prohibit the player from participating in any other league, including the NFL, for the season, ensuring that the team's investment in the player is protected. This restriction is put in place to maintain the integrity of the league and to ensure that teams are not disadvantaged by players leaving mid-season to join competing leagues.

In contrast, re-signing with the same CFL team, transferring to another CFL team, or negotiating a higher salary in the CFL are all actions that could potentially occur under specific circumstances, thus highlighting the unique nature of player contracts in professional sports and the importance of league rules regarding player movement.