Police are investigating after a man was found injured in the city centre during the early hours of this morning.
The 21-year-old was found in Long Row at roughly 1.45am and it is believed that he had been violently assaulted.
The victim remains in a critical condition at the Queens Medical Centre.
Police have closed Long Row, from its junction with High Street to where it meets the Council House, while specialist searches and forensic examinations are carried out.
The area would have been very busy at the time and police are appealing for witnesses.
Witnesses, or anyone with information, are asked to contact Nottinghamshire Police on 101 or call Crimestoppers anonymously on 0800 555 111.