The 31-year-old was loaned to Napoli in the summer, with Simon Mignolet, a June signing from Sunderland, now guarding the sticks at Anfield.
"At the moment it's difficult to think about being a Liverpool player next year," Reina is quoted as saying in the Daily Mail.
"They have a young goalkeeper in Simon Mignolet and the manager [Brendan Rodgers] 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, who spent eight years on Merseyside, admits he was caught off guard by the Reds' decision to farm him out.
"It did come as a surprise," added Reina. "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."