Tottenham Hotspur may be dealt a blow to their hopes of tying Son Heung-min down to a new contract. The 32-year-old forward faces an uncertain future in North London, with his deal set to expire at the end of the season.

With only a few months left on his contract, foreign clubs are currently eligible to open pre-contract talks over a free transfer in the summer. If the South Korea international doesn't pen an extension, the Lilywhites will have a tough decision to make before the end of the month.

Tottenham will have to consider whether they'd rather risk losing Son for free - if negotiations prolong - or cut their losses and cash in during the January transfer window. According to Spanish outlet El Nacional, as quoted by the Mirror, Barcelona look set to test Spurs' resolve.

READ MORE: Antonin Kinsky's Tottenham transfer and what he was forced to do after receiving phone call

READ MORE: Tottenham have already overcome transfer challenge set out by Ange Postecoglou ahead of 2025

The report states that the Catalan outfit have added Son to their shortlist despite ongoing financial issues. Due to spending rules in Spain, Barcelona could only afford to register Dani Olmo until December 31 - and they're still yet to get the green light to sign up him for the remainder of the season.

It's said that the midfielder has a clause in his contract – which runs until June 2030 – that allows him to leave the Camp Nou for free if they're unable to register him. Despite this, El Nacional adds that Joshua Kimmich and Leroy Sane have also been lined up, as well as Jonathan Tah who is said to be a long-term target.

Nevertheless, speaking in September, Son revealed that he's not yet held talks with Tottenham over a new deal. He said: "We haven't talked about anything yet. It is very clear from me. I am very focused on this season.

"At this age, every second is like a goal, especially this season, we are in a lot of competitions, it feels like I am taking even more care about this. As I say, I am fully focused on this year and just want to win something that everybody at the club - the players, all around - deserves.

"That's what I'm working for. In the future you never know what will happen, but I will give everything for this club because it's been almost 10 years and I give everything. I still have a contract with the club which is the very important thing and I just want to give everything until my contract [expires]."

Meanwhile, Ange Postecoglou refused to comment on Son's future last month. The Spurs boss said: "Right now all I care about is Sunday. I couldn’t care about people’s contracts.

"I couldn’t care about their situations. What I care about is Sunday and I want to make sure we have a group of players on Sunday who are ready to go out there and fight."