The 43-year-old had previously won the Super Bowl six times during his 20 seasons with the New England Patriots.
“In pursuit of 8…LFG Buccaneers we’re keeping the band together,” Brady wrote on Twitter above an image of him appearing to sign the contract.
Brady ranks first in NFL in history in touchdown passes (581) and second to Drew Brees in passing yards (79,204).
He started all 20 games for the Buccaneers in 2020-21 and led them on a team-record eight-game winning streak that culminated in Super Bowl LV, where Tampa Bay became the first team ever to win the Super Bowl at their own home stadium.
Additional reporting by PA.