Now back, he's looking to see what opportunities exist for him.
James Finch, owner of the No. 51 car at Phoenix Racing, said he'll likely use Regan Smith next week at Charlotte Motor Speedway but isn't opposed to talking with Allmendinger. Kurt Busch is replacing Smith at Furniture Row beginning next week, and Finch has six races to fill this year.
"I like AJ, I'd be willing to do something with him, but I don't know what sponsors would have to say about him," Finch said. "It's something I just don't have an answer for right now."
Allmendinger said he'd love to drive for Finch.
"If I was able to get back in that car, that'd be great," Allmendinger said. "I'd love to get in a seat, I've definitely missed it."
There's also interest from IndyCar teams in Allmendinger, who won five races in Champ Car before moving to NASCAR in 2007. But the IndyCar season doesn't open until March, and its free agency period doesn't heat up until January.
"That makes it hard because you have to wait for a long time to really get an idea of what's out there," Allmendinger said.
He also could partner with longtime friend Michael Shank, who fields a team in the Grand-Am Series. Allmendinger drove Shank's winning entry in the 24 Hours of Daytona, and the two formed an IndyCar team that never got on the track in 2012 because of Shank couldn't secure an engine deal.