That’s according to The People who say the Ajax star has downed tools.
It's suggested he refused to board the team bus for their season opener against Heracles.
Spurs have bid £20m for the Colombian centre-back.
However, they could end up paying significantly more for the 21-year-old star.
Dutch sources have informed Starsport that Ajax were prepared to sell him for £22.6m.
But with the transfer market over heating across Europe, Ajax could now demand £35m.
The Eredivisie heavyweights have also offered Sanchez a new contract in an attempt to persuade him to stay.
However, he is expected to tell Ajax bigwigs he wants a move to north London.
Crunch transfer talks were held in Amsterdam yesterday and the Spurs are confident a deal will be rubber stamped soon.
Tottenham have cash to splash having sold Kyle Walker to Manchester City for £52m.
But despite money in the bank, Mauricio Pochettino is yet to make a summer signing.
Spurs remain interested in Everton ace Ross Barkley.
Valencia defender Joao Cancelo is also on Pochettino’s radar.
