Josh Allen just pulled a Tom Brady. Here's why the QB's new extension with the Bills could spell trouble for Patrick Mahomes and the Chiefs.

The Buffalo Bills have reached an agreement with quarterback Josh Allen on a record-breaking deal. ESPN's Adam Schefter reported the news. Allen's new contract is a six-year $330 million deal, including $250 million in guaranteed money -- the largest guarantee ever given to an NFL player.

Palmer now joins Khalil Shakir, Keon Coleman, and Curtis Samuel in the receiver room, with Amari Cooper and Mack Hollins as free agents. And all of this happens on the heels of Sunday's news that Allen is signing a contract extension worth $330 million total ... but at $55 million per year.