Sylvester Stallone -- Bollywood 'Rambo' Actor Is BUFFER Than I Was

Sylvester Stallone says he's flattered that Bollywood is gunning to remake "Rambo" ... telling TMZ the guy rumored to play the lead role is way more RIPPED than he ever was.

Sly -- who's still in pretty damn good shape -- was leaving Cafe Roma in Bev Hills this weekend when he told us he was "flattered" by reports that Indian actor John Abraham would take over the role.

"Actually, he's built better than I ever was," Stallone told us.

FYI -- Abraham is a 40-year-old former model who's become a huge action star in Bollywood ... but in better shape than Stallone?? He was pretty jacked in "Rocky 4."