Borussia Dortmund have entered the race to sign Tottenham and Liverpool transfer target Heung-Min Son

The Hamburg youngster has impressed since joining the German club in 2010, and scored a superb goal in his side's 4-1 demolition of Dortmund over the weekend, taking his tally to nine for the season.
Son also found the back of the net when the two sides met earlier in the season.

Tottenham have been linked with a move for the 20-year-old in the past and were reportedly lining up a January move for him.While that failed to materialise Spurs could be preparing to make another move for the South Korean international, who has also been linked with Liverpool.Dortmund have been impressed with what they've seen this term and will challenge the likes of Liverpool and Spurs for his signature this summer.

Hamburg sporting director Frank Arnesen admitted Son would be available for the right price but pressed home the importance of extending the talented youngster's deal beyond it's current expiry date in 2014 in order to ward of potential suitors like Tottenham and Liverpool.
Despite reports of interest from Dortmund, Son's advisor Thies Bliemeister told Sport Bild: "I have heard of Dortmund's interest. But I do not know any more."