Spanish goalkeeper Reina is currently with Napoli on a season-long loan deal, having been moved on by the Reds last July following the arrival of Simon Mignolet.
There is still uncertainty about Reina's future beyond the summer, with Napoli reportedly interested in Hannover's Ron-Robert Zieler.
Reina has also been linked with the likes of Barcelona and Atletico Madrid, and he admits he is likely to be heading out of Anfield again next season.
Having enjoyed his time at Napoli under Rafa Benitez, the 31-year-old would welcome the chance to return to the Serie A club.
"I'm very happy here and my family's happy too," he told Piuenne television. "I'll be here right to the end, but not even I know what will happen after.
"I'm here now, but I've got to return to Liverpool, although it's unlikely I'll stay there."
Reina added: "Benitez was the most important figure in me arriving here. He convinced me to join this ambitious project at a great club.
"Obviously I also wanted to get to know a different league while it was Liverpool who took the first step by not wanting me anymore because they were placing their faith in a younger goalkeeper."
Napoli are currently third in Serie A, 13 points adrift of leaders Juventus, but Reina is confident they can claim some silverware this season.
As well as continuing their league challenge, Napoli have a Coppa Italia final against Fiorentina to prepare for and are in the last 32 of the Europa League.
Reina added: "We need to take things game by game, fighting on all fronts. Roma and Juve are not giving an inch, but now we're thinking about Europe.
"Thirteen points is a long way to be behind Juve, but we've always got to think positively, regardless of them.
"It's unlikely that they slip up now considering the pace they've sustained thus far, but it's up to us to do the impossible. We play every competition to win it.
"Now we're in the final [of the Coppa Italia], we want to win it, but we also know that Fiorentina are a great side.
"We've taken the first step, playing well against Roma and deserving to win and I'm delighted that we're now so close to winning."