Rob Gronkowski Offers Travis Kelce Retirement Advice

Rob Gronkowski is dropping some words of wisdom as Travis Kelce decides his NFL future ... telling the Kansas City Chiefs tight end to "listen to your gut feeling" before making anything official.

The future Hall of Famer shared his advice on "Good Morning America" on Monday ... saying while he feels Kelce would have a productive season if he returned in 2026, he understands it all comes down to what Travis wants to do -- as he's been in a similar place in his career, too.

"The only advice that I would give him, because I've been in this situation before, is listen to your gut feeling. If you truly love the game of football and you feel like you belong out there on the football field, well…