Police will continue the search for a missing swimmer on Thursday as they still try to confirm the man’s identity.

A search for a missing swimmer at Trigg Beach was scaled up on Wednesday after the man was seen in distress about 100 metres offshore around 5.15pm the night before.

Police say the swimmer was not seen getting out of the water.

Mounted police, Police Air Wing, Marine Rescue WA, and Surf Life Saving Crews are expected to be out again today as they continue the search.

Police are still trying to confirm his identity with the public urged to report any information about the swimmer.

No family or friends have come forward to report an official missing person in relation to the incident.

Police would also like to hear from anyone who may have been in distress in the water on Tuesday afternoon at Trigg Beach and self-rescued.

Anyone with information is asked to contact police immediately on 131 444.