MLB fans looking to own Shohei Ohtani‘s historic 50/50 home run ball might need to break a few more piggy banks for it than they initially expected … ’cause Ken Goldin just revealed to TMZ Sports it wouldn’t surprise him if the baseball sold for over $10 MILLION later this week.

Currently, the memento — which Ohtani smacked over a left field wall during a never-before-seen performance against the Marlins back on Sept. 19 — is a few mil away from getting to eight figures … but Goldin says it’s totally possible it reaches the plateau by the time the final gavel drops on bidding on Tuesday night.

According to the auction expert — whose auction house is actually overseeing the sale — most bids usually come in the final hours … and with it already being up over $2 mil, it can threaten the $10 mil threshold for sure.

“It wouldn’t blow my mind,” Goldin said, “if some foreign bidder put this to eight figures and it topped $10 million.”

Of course, buyers almost didn’t even get the chance to drop the coin on the baseball this month — after a lawsuit tried to halt the proceedings. But after Goldin reached an agreement with the plaintiffs in the case to move forward — it’s free game for everyone … including Ohtani himself.

Goldin says the Dodgers superstar can bid on it like everyone else — although he did say he and his company have not yet heard from either Ohtani or his team about potentially making an offer on it.