Sorry Patriots fans ... the guy who filled in for Rob Gronkowski in 2016 ain't interested in doing it again in 2019 -- with Martellus Bennett telling TMZ Sports he's retired for good.
Bennett -- who had 5 catches for 62 yards in the Super Bowl that season -- announced his retirement from the NFL in March 2018.
But, that was BEFORE Gronk decided to hang up his cleats ...
Remember, it was just back in February Marty joked about rejoining the Cowboys during a monster workout session in the gym.