Joe Theismann's Advice To Tony Romo is RETIRE

Joe Theismann knows what team Tony Romo should play for next year ... the stay your ass at home team ... telling TMZ Sports his advice to the Dallas back up QB would be to CALL IT A CAREER NOW.

Theismann talked to TMZ Sports about Romo's future ... which seems kinda hazy in Dallas now that Dak Prescott has the 'Boys with the best record in the NFL.

Joe told us flat-out the best option for Romo isn't Denver, Minnesota, or Chicago ... it's actually to leave the game alone before his injuries make his post playing life unlivable.