The Chelsea left-back only signed a new long-term deal in October but his form has dipped this season.
Maurizio Sarri has rotated between Emerson and Alonso at left-back this season and it’s unclear who will start next week’s Europa League final.
Atletico Madrid and Real Madrid have been linked with a move for the 28-year-old and the Chelsea defender refused to rule out a summer exit despite being happy at the club.
“I am very happy here but we will see what happens this summer,” he told the London Evening Standard.
“There is always talk. Is it a compliment? Yes. It means I’m doing well if others teams are trying to get in touch.
“But first of all I’m focussing on the final. I am very happy to have four more years here and hopefully I will stay many more years here.”
Chelsea will not be able to sign players this summer if the Court of Arbitration for Sport (CAS) do not temporarily lift their FIFA-imposed transfer ban.
Given the uncertainty of so many other Chelsea players, it’s unlikely Sarri’s side will even entertain his exit this summer unless a substantial bid is received.
Since joining Chelsea from Fiorentina in the summer of 2016, Alonso has played a direct hand in more goals than any other defender in the Premier League (24).