Bayer Leverkusen's South Korean midfielder Son Heung-Min is on the verge of joining Tottenham, German media reported Wednesday.

The 23-year-old, under contract with Leverkusen until 2018, is due in London to take a medical ahead of a deal worth an estimated 30 million euros ($34 million, (£22 million), German dailies Kolner Stadt-Anzeiger and Sport Bild reported.

Contacted by German news agency SID, a subsidiary of AFP, Leverkusen refused to comment on the news which broke hours before their Champions League play-off second leg against Lazio.

The transfer window closes on Monday in Germany and 24 hours later in England.

Son arrived at Leverkusen in the summer of 2013 in a 10 million euros move from Bundesliga rivals.