Police are now treating an attack on a man found with serious facial injuries as attempted murder.

The 37-year-old was found seriously injured in Wilson Street, Renfrew, at around 1.10am on Sunday.

He was taken to hospital and remains in a critical condition in Glasgow's Queen Elizabeth University Hospital.

Police said they believe he was attacked by one man and appealed for information.

Detective Inspector Nathan Calderwood at Paisley CID said: "We now have information to suggest that the 37-year-old man sustained his severe injuries after being assaulted by one man and it is vital that we trace the person responsible.

"We previously appealed for three men who were seen standing outside the motorbike shop in Dunlop Street around this time to contact police and I can confirm that they have done so.

"I now would like to speak to a man who was seen around 0020 hrs on Sunday 14 January walking from Houston Street, into Wilson Street and towards Renfrew Town Hall.

"It is vital that this man contacts police immediately as he may be able to provide crucial information that could assist our enquiries. "

Anyone with information is asked to contact Paisley Police Station via telephone number 101 quoting incident number 0309 of 14 January 2018.

Alternatively calls can be made anonymously to Crimestoppers on 0800 555 111.