Bale, who wants to move to Real Madrid, skipped training on Tuesday, and he did not turn up at the north London club's base on Wednesday.
The 24-year-old did not take part in Wednesday's open training session and Press Association Sport understands he was not on the Enfield complex at all.
Manager Andre Villas-Boas is expected to clear up why Bale has been missing on Wednesday afternoon at a press conference to preview Tottenham's Europa League play-off against Dinamo Tbilisi.
On Sunday the Portuguese said he expected Bale to report to the club's training ground in Enfield on Tuesday but, unlike the rest of his team-mates, the 24-year-old did not show and was absent again on Wednesday.
There is a growing feeling that Bale is becoming annoyed at Tottenham's conduct in the whole transfer saga and that he is trying to force through a deal to Madrid.
A Spurs source said there was "no issue" with Bale not turning up on Tuesday, and the club insist that the player remains in touch with Villas-Boas about his training regime.
This contradicted earlier reports that Bale was "furious and frustrated" with Tottenham's handling of his proposed world-record transfer to Madrid.
Professional Footballers' Association (PFA) chief Gordon Taylor has called on Spurs to allow Bale to leave for the Bernabeu.
"Players have, invariably, just the one career, it's, usually, a relatively short career, and here a player has such a tempting offer to play for one of the world's greatest-ever clubs," Taylor told Zapsportz.com.
"Surely nobody could deny him that right, to play for such a club, with all due respects to his present club.
"The game is all about money. Of course, it always was, but much less of it in the past. Now we are talking about incredible numbers, but for the player it is also an opportunity to play at the pinnacle of the game."