Two teenagers have been arrested on suspicion of robbery following an incident in Mansfield on Saturday night.
Nottinghamshire police said a 34-year-old man suffered a stab wound to his lower body at around 7.45pm and was being treated at the Queen's Medical Centre.
The two youths, aged 16 and 17, remain in police custody following the incident on Tuckers Lane.
A police spokesperson said: "Detectives are appealing to anyone who might have seen or heard anything suspicious in the area around the time it happened to contact them on 101, quoting incident 712 of January 20, 2018."
Information can also be passed to Crimestoppers anonymously on 0800 555 111.