Alex Rodriguez is fuming over losing the Mets to billionaire Steve Cohen and griping that the process was rigged, multiple sources tell The Post.

Sources close to the former Yankees slugger say they lost the Queens team on Friday, Aug. 28, after the Mets’ banker — Steve Greenberg of Allen & Co. — reached out to ask for a sneak peek at what was being offered. The request came days ahead of the official Aug. 31 bidding deadline.

A-Rod — who has been vying for The Amazins with his superstar fiancee, Jennifer Lopez — reluctantly complied with the request only to learn later that same day that the Mets were in exclusive deal talks with Cohen.

The founder of Point72 Asset Management had offered $2.35 billion for the team — or just $50 million more than the $2.3 billion bid offered by Rodriguez and his group of investors.

The former Yankees third baseman is now convinced that the Mets spoon-fed his bid information to Cohen so the billionaire financier and art collector could have the highest offer and win the team. “They took the bids and showed them to Cohen,” a source familiar with A-Rod’s thinking claimed.

Preparing for the start of his third season as an analyst on ESPN’s Sunday night telecasts, Rodriguez said players’ leverage had changed since they fought off the owners’ salary-cap proposal with a 7-month strike in 1994-95. He said the rise of the NFL and NBA had changed the equation along with digital media, and said the players’ association should work collaboratively with MLB to raise the sport’s market share.

“The only way it’s going to happen is if they get to the table and say the No. 1 goal, let’s get from $10 to $15 billion and then we’ll split the economics evenly,” he said Thursday during a conference call. “But that’s the type of conversation instead of fighting and fighting against each other because there’s too much competition out there right now.”

Baseball players have resisted the salary-cap and revenue-sharing approaches used by the NFL, NBA and NHL.

“Alex benefited as much as anybody from the battles this union fought against owners’ repeated attempts to get a salary cap,” union head Tony Clark said in a statement. “Now that he is attempting to become an owner himself his perspective appears to be different. And that perspective does not reflect the best interests of the players.”

The first round of bids for the Mets are in — and for starters Steve Cohen appears to have made the highest offer.

Cohen, the hedge-fund billionaire who had previously offered $2.6 billion only to see the deal fall apart at the 11th hour, delivered the Wilpons an offer for $2 billion this time, according to a Fox Business report. That report stated Cohen is also willing to offer an additional $2 billion to also acquire SNY.

Cohen’s bid wasn’t the only one to come in before Thursday’s deadline.

Alex Rodriguez and Jennifer Lopez have their necessary funding and made a bid that is likely good enough to keep them in the game, sources told The Post.

The former Yankee slugger’s bidding group offered around $1.7 billion, two sources close to the situation said.

A recent episode of ESPN’s Get Up was a particularly egregious session in which Mike Greenberg and Mark Teixeira extolled the owners’ deal and minimized player concerns. As our Andrew Bucholtz put it, “it’s rather funny to see Greenberg and Teixeira, two people who have been quite enriched by agents’ attempts to get what their labor is “worth,” out here arguing that MLB players should just take whatever owners are proposing to them.”

The same can be said of Alex Rodriguez, who, for many, is the posterchild of enriching one’s self in order to get paid their true worth, and who is now trying to get players to agree to this deal out of a sense of duty to baseball fans.

“It is the people’s comfort food and people are starving. And I just don’t want to see this great game, people fighting, billionaires fighting with millionaires. This has nothing to do with the past. This has nothing to do with the strike. This is actually when the owners and players are aligned and we want the same thing. We want to save baseball. We want to play baseball.

“Players want to play. Fans want to watch. And at the end of the day, if you don’t play today, you don’t win tomorrow, because hopefully, we don’t have another situation like this. This is like beyond anything we’ve ever seen before. I just urge the players and owners to think collectively. If there’s $100 in the pie, like the NBA, players take $50, owners take $50. And we give it to the fans. We thank the fans of baseball.”