Police say the 68-year-old was found seriously injured in the High Blantyre area at around 11pm on Sunday, May 3.
He was then rushed to Hairmyres Hospital, where medical staff described his injuries as life-changing. The man is said to be in a stable condition.
Now, detectives are trying to establish how he sustained his injuries.
Officers believe the man was in the High Blantyre area between Friday, May 1, and Sunday, May 3.
Police are urging anyone who may have seen him during that time to come forward.
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The man is described as white, around 5ft 11ins in height, of medium build, with short, dark hair. When he was last seen, he was wearing light blue shorts and a t-shirt.
Detective Inspector Ally Thom said: “We are working to piece together the man’s movements over the course of the weekend and to establish exactly what has happened.
“I would ask that motorists with dash-cam footage, and residents with private CCTV or doorbell cameras in the area of Millheugh Place, Larkfield Drive, Moray Place, Nairn Street, Priestfield Street, Waverley Terrace and Main Street, please review their recordings, as they may have captured something which could assist our investigation.”
Anyone with any information is asked to contact Police Scotland on 101, quoting incident number 2339 of Monday, May 4, 2026.




