Mike Piazza is ‘very disappointed’ his post-9/11 Mets jersey is up for auction

Mike Piazza is upset the New York Mets jersey he wore during what was perhaps the most iconic game in his Hall of Fame career now appears to headed off to the highest bidder.

He wore it on Sept. 21, 2001, when the Mets played Atlanta in the first regular-season home game by a New York team following the Sept. 11, 2001, terrorist attacks on the World Trade Center.

“I’m very disappointed with the situation regarding my game jersey from September 21st, 2001,’’ Piazza told The New York Post on Tuesday.

Piazza hit a go-ahead, two-run home run in the eighth inning of that game, and fans waved American flags and chanted, “U.S.A.! U.S.A.!” as they celebrated.

“I’ve expressed my feelings to Jeff [Wilpon] and the Mets. And while it never should have left Citi Field, they have assured me that contact with the seller has been made and they are making a concerted effort to get the jersey back. I’m hopeful that an agreement can be reached and we can give back to the fans and all New Yorkers a piece of that evening that was more than just a game.’’

The Mets sold the jersey -- which is signed by Piazza and features three American flag patches -- three years ago to a private collector, who had allowed them to keep it on display in their museum at Citi Field.

But with the one-time Dodger getting a Hall of Fame nod this season, the jersey has been sent to Goldin Auctions, which plans to auction it April 30.

“We made a mistake in selling the jersey and Jeff called Mike to express our regret in so doing,’’ the Mets said in a statement to the Post. “We have dedicated a section in the Mets Hall of Fame and Museum to celebrate Mike’s achievements and his induction into the National Baseball Hall of Fame and are exploring memorabilia to display in that area.

“We can’t verify the item being auctioned, but can confirm that our memorabilia group sold a jersey that meets this description, which was not authenticated with respect to game use.’’

Ken Goldin, president of Goldin Auctions, told the Post that the Mets sold the jersey “to our consignor as the jersey he wore on 9/21/2001. It comes with a letter of authenticity from the NY Mets, it comes with a Photo Matched Letter of Authenticity from MeiGray [a jersey authenticator]. It comes with the display plaque when it hung in the Mets Museum that states, ‘In this jersey Mike Piazza hit the game winning home run on 9/21/2001.’ ”

Goldin added: “I have spoken to the Mets about the jersey. The New York Mets are well aware that lot 23 in Goldin Auctions current auction is the jersey worn by Mike Piazza on 9/21/2001.’’