Reports suggest that the asking price is designed to offer a hands-off or pay-up warning to Premier League clubs eyeing the 28-year-old ahead of a potential summer move, with London rivals West Ham and Chelsea said to be interested - according to the Independent.
Despite making 26 league appearances last season, Dembele started on just 10 occasions for Spurs, leading to suggestions that he would exit the White Hart Lane outfit during the current window.
Nonetheless, he featured in the Lilywhites' opening weekend fixture versus Manchester United, and largely impressed, despite the club's disappointing 1-0 defeat.
He offered less than anticipated in the final third, but weighed in with four tackles and two aerial duels, while completing 91% of his total attempted passes as he capitalised on a rare start for the club.
This appearance at Old Trafford seemed to suggest that the Belgian has a future at White Hart Lane, while latest reports suggesting a substantial asking price further affirm this notion.
It was believed that Spurs may be prepared to cash in on him during the summer window, but with two years left on his current deal, he seems set to remain in the club's first-team plans.