Brady is still under contract with the Buccaneers and has hinted at a possible return, although coach Bruce Aryans told the NFL Combine last month that, based on his conversations with seven-time Super Bowl-winning quarterback, he believed Brady had closed the door on his return.

The last touchdown pass of his career, the ball thrown by quarterback Tom Brady, sold for  518,000 as a member of the Tampa Bay Buccaneers, according to auction site Leylands.

A total of 23 people bid for Brady's last touchdown ball, with an initial bid of 100,000. Some on the site predicted that the ball could fetch up to $ 1 million.

Brady is still under contract with the Buccaneers and has hinted at a possible return, although coach Bruce Aryans told the NFL Combine last month that, based on his conversations with seven-time Super Bowl-winning quarterback, he believed Brady had closed the door on his return.

After last season's end, Gronkowski's future was in the air as his contract with the Bucks ended and his good friend Brady announced his retirement.