AC Milan vice-president Adriano Galliani is confident Antonio Cassano will make a full recovery after being taken to hospital with a sudden illness.
Cassano has remained at the Policlinico facility where he was taken for tests after Milan's plane landed following their 3-2 victory over Roma.
The player has already undergone scans is due to have other check-ups, althought for privacy reasons details of his illness are yet to be disclosed.
The ANSA news agency reported passengers saw Cassano joking with team-mates, before suddenly developing problems with his vision, speech and movement.
Galliani said: "I've just spoken to Antonio. I'm convinced he'll get better; he's already feeling better now. He's in a good mood and he seems calm.
"Problems of this kind are part of life. Unfortunately, life is made up of so many things and footballers are human beings like the rest of us and can have the problems just like everyone else."
29-year-old Cassano has scored three times this season for Milan and head coach Massimiliano Allegri is hopeful that he will be back in action when they travel to Fiorentina after the international break.
"We hope to have him back as soon as possible, maybe after the break. I talked to him yesterday and he seems calm and is recovering well.
"All the squad is in shock and very upset by what has happened."