The Spaniard was loaned to Napoli in the summer as manager Brendan Rodgers brought Belgian stopper Simon Mignolet to the club from Sunderland.
The arrangement may be a temporary one, but Reina, who is back working under former Reds boss Rafa Benitez in Italy, does not expect to return to Anfield.
"At the moment it's difficult to think about being a Liverpool player next year," the 31-year-old told the Daily Mail. "They have a young goalkeeper in Simon Mignolet and the manager prefers him to me.
"That's the reason why I'm here and he will be at the club next year as well. There's no reason to think I'll be a Liverpool player from now on but we'll see where the future takes us.
"It's been a good move so far and I don't regret what happened. I would have preferred to say goodbye in a different way."
Reina had not been expecting to move in the summer.
"It did come as a surprise," he said. "It was the club [Liverpool] who made the move. I was on my holidays and nobody told me anything.
"Suddenly Napoli called and said they were agreeing terms with Liverpool and Liverpool just rang me two days later and said the same. They probably had their own reasons."