The Spaniard has fallen behind the fullback pecking order over the last 18 months and is out of contract at the end of the season.
And it seems the 26-year-old is unlikely to resign with the Reds after his latest comments to Cadena Ser.
He said: "I do not feel good, that is the truth. I hurt myself giving everything for this team and I think that when I came back from injury, I deserved an opportunity.
"The situation is normal for a lot of players but simply I did not like the way he (Jurgen Klopp) has treated me, you can say that.
"Moving back to Spain is something I have thought about, I am tired of the cold here but I do not know about interests from other clubs.
"I am in my fifth year here, there is no agreement on a renewal and in January I am free to listen to any offer."
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