Tom Brady Belongs On Sports' Mt. Rushmore, Deion Branch Says

If an artist begins carving a new sports Mt. Rushmore into the side of a mountain in South Dakota in the upcoming weeks ... Deion Branch tells TMZ Sports Tom Brady is a for-sure lock to have a place in it.

The ex-NFL star insisted Wednesday just hours after Brady called it a career -- for real this time (we think) -- the former Buccaneers and Patriots quarterback has done enough to be considered one of the unanimous four best athletes ever.

Branch didn't want to say where he'd rank TB12 amongst the quartet -- but he said the ex-signal caller definitely belongs in the same conversations as the Michael Jordans, Wayne Gretzkys and Derek Jeters of the sports world.

"We do know that Tom is the greatest to ever put on a football jersey," Branch said ... before adding, "Tom will go down as the greatest football player to ever play the game."

Of course, Branch is a bit biased -- he played seven seasons with Brady in New England, winning two Super Bowls and an SB MVP with the QB -- but there won't be too many people arguing against his opinion.

Brady played 23 seasons in the league, winning seven Super Bowls and three MVP awards. He also made 15 Pro Bowl teams, 3 All-Pro teams, and retired as the NFL's leader in passing yards (89,214) and passing touchdowns (649).

Branch tells us the QB should have absolutely no regrets about not hanging things up sooner ... and, in fact, he said he's happy for the 45-year-old over the way he got to do it all.