At approximately 19.07pm this evening (Monday 5th August), officers were called to a report of an injured man, that was found in the area of the B4245, it was reported that a bicycle was in close proximity to the injured man.
He has been taken to the Royal Gwent Hospital with serious injuries and remains in a critical condition.
Gwent Police along with the Welsh Ambulance Service attended and officers remain at the scene.
The road remains closed and diversions are in place which will cause congestion.
Officers are now trying to establish the circumstances of this incident and are requesting any motorists using the road around this time to please check any dash cam footage that may provide further information that will assist officers with their enquiries.
Anyone with any information or anyone who may have witnessed the incident is urged to contact Gwent Police on 101 or Direct Message us on Facebook or Twitter, quoting log 470 05/08/19