"Adriano has not returned," read the club website on Friday following media reports he had missed his flight from his homeland.
The powerful striker, an unused substitute in Brazil's 3-0 win over Peru and a 1-1 draw with Ecuador in World Cup qualifiers, is likely to be fined and dropped from Inter's squad for Sunday's visit to Udinese, media reported.
The 27-year-old had edged back in Mourinho's good books after returning late from the winter break having irritated the coach with a perceived lack of commitment earlier in the season.
The affair is likely to increase speculation about the player's long-term future after Adriano said this week he would decide at the end of the season whether to extend his contract with the Italian champions, which runs until June 2010.
A late return from Brazil was among the incidents of indiscipline that led to friction between Adriano and Mourinho's predecessor Roberto Mancini.
