The north London club were briefly occupying top spot in the Premier League toward the start of the season, but their form has plummeted sharply over the last few months.
They have just three wins from their last 12 Premier League games and have earned just 12 points from that run of fixtures.
Spurs have lost five of their last six league games and a failure to pick up results is now affecting the mood in the squad.
It has been claimed that a number of Tottenham players are now unhappy with the methods the Spurs boss has been employing.
Some of the attackers are feeling increasingly frustrated with Mourinho’s training style being too focused on defending rather than taking a proactive approach.
There are suggestions that some players feel that they are still employing the methods in the final third that they learned under Mauricio Pochettino.
Some Spurs players feel that build-up to games is being consumed by the fears of what could go wrong rather than the team wanting to play good football.
Mourinho is yet to lose the complete dressing room, but there are increased grumblings behind the scenes as Spurs continue to struggle.