Arians missed practice Thursday with the flu, but he later returned to the Colts and was at practice as the team prepared to face the Ravens. The Colts told Jones that Arians is "fine," which is great to hear, and NFL.com's Ian Rapoport reported that Arians was joking in the hospital and wanted to coach, but doctors won't let him leave with what they believe is an inner ear infection or a virus.
UPDATE: NFL.com's Ian Rapoport is reporting that Arians' illness is believed to be a reaction to medication he took this week. The plan is to keep him in the hospital overnight. He will travel back to Indianapolis on Monday.