Salah, the speedy 21-year-old Egyptian, is in rich form having scored six goals for his country in their World Cup qualification campaign.
He caught the eye with his performance against Chelsea in the Champions League earlier this season.
Spurs boss Andre Villas Boas was keen on Salah earlier this year but wanted to see whether he continued to progress.
Villas-Boas has asked to be kept informed with Basel ready to sell in January but the Swiss side want £15m.
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