A representative for Robbie Coltrane is adamant the Harry Potter star will be "fine" after he was taken ill on a flight to Florida on Thursday (29Jan15).
The 64 year old was rushed to hospital upon arrival in Orlando after he suffered flu-like symptoms during his journey from London.
His agent Belinda Wright confirmed he was still receiving treatment and would remain in the medical facility for the coming days, adding, "The prognosis is that he is going to be fine."
Coltrane has been forced to pull out of an appearance at a three-day Harry Potter convention, which begins on Friday (30Jan15).
A statement from Warner Bros. reads, "Robbie took ill last night and is getting the rest he needs to feel better. We are sorry he cannot be with us this weekend and look forward to seeing him up and about soon."
Michael Gambon, who played Professor Dumbledore, Luna Lovegood actress Evanna Lynch, and James and Oliver Phelps, who played the Weasley twins in the wizard franchise, will attend the event.