Spurs have already held discussions with the South Korean international over a big money move to White Hart Lane this summer but Dortmund have expressed their interest, leaving Tottenham with some persuading to do.
Son is out of contract in 12 months’ time and has turned down an improved offer from Hamburg in order to push through a big move in the next few months.
Spurs were confident of sealing a £10million deal to bring Son to London before Dortmund entered the race and the Bundesliga club have a wedge of money to spend from the sale of Mario Gotze and appearance in the Champions League final.
Spurs will want to sign at least two strikers this summer after Jermain Defoe and Emmanuel Adebayor failed to make much of an impact in their quest for Champions League football that may well fall short.
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