Bale, who is closing in on a move to Real Madrid, has failed to show up for training for two consecutive days.
Villas-Boas said: “He is involved in a big transfer move to Real Madrid and in the end if it happens, we wish him all the best, but the fact that he hasn’t turned up is not the correct behaviour.
“That is the position they chose to take and it’s up to the club to decide if it’s a fineable offence. It could happen very, very soon.”
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