Toronto police say a man is in hospital in critical condition after a fall at the Keg Mansion downtown Sunday morning.

According to police, workers were cleaning up after a busy day when a man on the roof of the Jarvis Street restaurant fell through the skylight, sustaining very serious injuries.

He was rushed to a trauma centre via emergency run.

Const. David Hopkinson said staff did not recognize the man who fell and police do not believe the victim was an employee.

Police are calling the incident "suspicious" and officers are continuing to investigate.