The former House speaker from Georgia said, though, he would consider a pro-bono adviser position for a Republican president like he was for President George W. Bush, The News Journal of Wilmington, Del., reported.
"Not because I'm opposed to Mitt," Gingrich said. "If the choice does end up being Romney versus Obama, I can be very enthusiastic for Romney."
Gingrich said even though he believes Romney will likely receive the GOP nomination for president, he's not planning to suspend his campaign.
"Romney is going to have to focus on what he'll actually do as president," he said on WILM radio. "Who do you think can debate Obama in September and October and defeat him? We have to have somebody who can stand on the same podium and beat him."
Meanwhile, Gingrich criticized Fox News Channel Wednesday for what he said was clear support for Romney, Real Clear Politics reported.
"I think Fox has been for Romney all the way through," Gingrich said during the private meeting with 18 Tea Party leaders at Wesley College. "In our experience, Callista and I both believe CNN is less biased than Fox this year. We are more likely to get neutral coverage out of CNN than we are of Fox, and we're more likely to get distortion out of Fox. That's just a fact."