The Kansas City Chiefs and Patrick Mahomes are expected to sign a contract extension this offseason once the NFL's new collective bargaining agreement is finalized. 

Mahomes will almost certainly become the NFL's highest-paid player.

Mahomes will be on the final season of his deal in 2020 with $2.7 million in guaranteed money pending a fifth-year option.

Ian Rapoport reports it is likely to be a "mammoth" contract.