The update followed online speculation about O'Neill's health, prompting Celtic to issue a brief statement asking supporters to respect his family's privacy. Club Statement Moves To Calm FearsCeltic offered little detail about the procedure, saying only that it was minor and that O'Neill's recovery was progressing as expected. The club said: 'In response to speculation, we can confirm that Martin O'Neill has undergone a small procedure in hospital. The club has not said whether O'Neill will be fit to lead the side against Kilmarnock on Sunday, and no timeline beyond the expected hospital discharge has been provided. There is no indication the procedure was anything more serious than Celtic has described, though the club has not provided further medical detail.