South Korea star will make a final decision about his future this summer.
Tottenham Hotspur face an uphill battle to be able to convince exciting young Hamburg forward Heung-Min Son to move to White Hart Lane at the end of the season, according to reports in the London Evening Standard.
The highly-rated South Korea international, 20, had been expected to join the north London giants as soon as the summer transfer window reopened for business on 1 June.
However, their move for the attacker has been put in doubt after reports in Germany emerged that Uefa Champions League finalists Borussia Dortmund are now also keen to sign Son as a potential replacement for the Bayern Munich-bound Mario Goetze, who has agreed to join the Bundesliga champions for next season for £32 million.
Son’s contract with Hamburg only runs until May 2014 and so his employers are keen to offload the player this summer, as opposed to losing the striker for free next year, and so any offers in the region of £10m will be enough to convince his club to part company with an attacker who has netted 19 goals in 74 matches for them since 2010.