SF Giants Manager Ain't Worried About Fat Pablo Sandoval, 'He's Healthy!'

He's bigger than ever -- but Pablo Sandoval's weight gain isn't bothering his boss ... with  SF Giants Manager Gabe Kapler insisting "Kung Fu Panda" can still ball.

Here's the deal ... Giants fans were shocked when the switch-hitting infielder -- listed at 5'10", 268 lbs -- reported to camp last week looking like he let himself go during the offseason.

Sure, there's been some fat-shaming online ... but the big question -- how will the weight gain affect his performance on the field?

According to Kapler, 33-year-old Pablo is still playing like a world-class athlete!

"I think it's understandable that in today's world we focus on weight," Kapler said on Sunday according to MLB.com ... "I get it."

"In this particular case, what we've all noticed about Pablo is that the ball is jumping off his bat, and his throws have nice carry."

"Obviously, we've had concerns about whether he was going to be ready [after Tommy John surgery] and at what point he was going to be ready to play 3rd base and 1st base. He's demonstrated that he's healthy. That's the most important thing."