Forget the Ghostbusters ... the MLB should give Zak Bagans a call if the Milwaukee hotel players stay at is indeed haunted -- 'cause the "Ghost Adventures" star tells TMZ Sports he'll rid the place of any ghouls and goblins if they're there!!

Talk of the Cream City's potentially haunted B&B cropped back up again this week ... when Dodgers star Teoscar Hernandez ditched his teammates at the legendary Pfister Hotel over claims the place was jinxed. Getty

Hernandez said his wife had heard all the horror stories of baseball players being toyed with by ghosts at the establishment -- so he had to find other lodging for L.A.'s NLCS road matchups against the Brewers.

Bagans told us the situation is actually no laughing matter -- and if Rob Manfred and Co. want to assuage the issu

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