Hamburg sporting director Frank Arnesen has hinted that Arsenal and Tottenham Hotspur target Son Heung-min could leave the German club this summer if he opts against signing a new contract, reports Sky Sports.
The 20-year-old forward is widely regarded as one of the brightest young prospects in Germany at the moment, and has also attracted admiring glances from Bundesliga rivals Borussia Dortmund.
Gunners boss Arsene Wenger has been credited with an interest in bringing the South Korea international to the Emirates Stadium, but will face competition from Tottenham, with Andre Villas-Boas also believed to be monitoring the player's situation at the Imtech Arena.
Son is under contract with Hamburg until 2014, but officials have been keen to extend his current deal amid speculation linking him with a host of top European clubs.
However, so far negotiations have proved unsuccessful, and now Arnesen admits that the club might be forced into selling one of their prized assets at the end of the season to nullify the threat of the Asian star from walking away on a free transfer next year.
"Heung-min Son is under contract with our club and we are talking to him about signing a new contract," the Hamburg director told German publication Bild.
"Obviously we will have to sell him, if he does not sign a new deal with our club!"
Arsenal and Spurs would both represent attractive options for Son, with the prospect of testing himself in the Premier League believed to be high on his list of ambitions, as well as an opportunity to play in the Champions League.