Jacek Muszynski was last seen on Friday (July 14) and police are concerned for his welfare.
Since the 63-year-old was reported missing, police have been carrying out extensive enquiries to try and locate him and are now turning to the public for assistance.
Jacek is described as being white, around 5ft 9ins tall, with short grey hair.
He was last seen wearing blue jeans, a blue coat, black trousers, black cap and glasses.
He may appear confused if you talk to him.
Police believe he will be in the Portsmouth area now.
If you have seen Jacek or have any information on his whereabouts, then please call 101, quoting the reference 44230283254.
