Dembele, 28, has had an inconsistent three years at Spurs having joined from Fulham back in 2012, but he is certainly having his best season to date so far.
The Belgian's power and drive in midfield has been vital to Tottenham's great start this season, but there is some confusion over his long-term future at White Hart Lane.
Dembele's current deal expires in the summer of 2017, and the Daily Mail reported earlier this week that Tottenham chairman Daniel Levy doesn't want him to enter the final 18 months of his contract, and will offer the midfielder a new deal imminently to tie his future to Spurs.
However, London rivals Chelsea are allegedly aware of Dembele's contract situation, and are lining up a huge £20m bid for the player, according to the Daily Mirror.
The Blues - who face Tottenham on Sunday - have had a dismal start to the campaign, and could look to add a powerful player like Dembele to help them in the middle of the park.
It seems highly unlikely that Levy would deal with Chelsea, and it would be much more likely that Dembele ends up penning a new contract to stay at White Hart Lane having enjoyed a much greater role under Mauricio Pochettino this season.