Six-time Super Bowl champion Tom Brady has agreed terms on a two-year contract extension with the New England Patriots, according to multiple U.S. media reports on Sunday.

A day after his 42nd birthday, Brady - who will begin his 20th NFL campaign next month - has a deal that will boost his 2019 salary from 15 million to 23 million U.S. dollars, the NFL Network and ESPN reported, citing unnamed sources.

The future Hall of Fame quarterback has won the most Super Bowl titles of any player in the league's history, as well as four Super Bowl Most Valuable Player and three NFL MVP awards.

Brady would have been entering the last year on an existing two-year deal next month. Instead, he's under contract through the 2021 season, when he will be 44 years old.

Brady has talked of playing until age 45 and the new deal could make that a possibility.

Last week, he said: "I am trying to do the best I can do today and let those things (contract negotiations) work themselves out."

Even with the pay boost, Brady is set to have only the sixth-highest salary among quarterbacks this season.

In February, Brady led the Patriots over the Los Angeles Rams 13-3 in Super Bowl 53 for their third NFL crown in five seasons.

Brady has career totals of 6,004 completions on 9,375 pass attempts for 70,514 yards and 517 touchdowns with 171 interceptions. He has also rushed for 1,003 yards and 19 touchdowns.

The NFL legend has started every game for the Patriots in nine of the past ten seasons, throwing for 4,355 yards and 29 touchdowns last season.