The Indianapolis Colts and guard Quenton Nelson signed a contract extension Saturday, the team announced.

It's a record four-year deal worth $80 million, a source told ESPN's Adam Schefter. The pact, which reportedly includes $60 million guaranteed, makes Nelson the highest-paid guard in NFL history. He tops Brandon Scherff, who inked a three-year, $49.5-million contract with the Jacksonville Jaguars earlier this year.

Nelson is also the league's fourth-highest-paid offensive lineman in average annual salary. He trails left tackles Trent Williams, David Bakhtiari, and Laremy Tunsil.