The Daily Mail says Spurs are currently unsure of their influential midfielder's whereabouts.
Despite not travelling to Los Angeles ahead of Tuesday's clash against the LA Galaxy, Modric is expected to turn up to the club's Spurs Lodge headquarters on Monday to train with those not on the trip.
It is understood Spurs have already slapped Modric with a fine of two weeks wages - around £80,000 - for his growing list of misdemeanors.
And the playmaker can expect further disciplinary procedures taken against him if he does not turn up to training.
Modric's mini strike is aimed at forcing through his move to Real Madrid.