Cassano hospitalised by mystery illness
Cassano seems likely to miss the trip to Belarus for Tuesday's Champions League Group H game against BATE Borisov.
"Antonio Cassano was taken ill last night on the arrival of the flight from Rome," Milan, who won 3-2 at AS Roma in Serie A on Saturday, said in a statement.
"The player was taken to Milan's Policlinico hospital for checks."
Media reports in Italy said Cassano, who helped Milan win last term's scudetto, could hardly talk or move.