The 31-year-old Welsh forward made an emotional return to his former club in the summer as he joined on a year-long loan from Real Madrid.
But Bale has made only four appearances in the Premier League, starting once.
ESPN says Bale has been impressing in training, and for that reason a number of senior figures in the team cannot understand why manager Jose Mourinho has not made more use of him.
Bale himself is believed to be happy at Spurs, but will surely expect to be give more opportunities in the second half of the season.
Reports suggest that currently there are no plans in place for the club to extend Bale's stay beyond this season.
And that only looks likely to change if his performances significantly improve in the near future.