A man in his 50s was walking near the playground in Avenham Park when he was approached by three of four men at around 7am on Monday (November 14).
The victim was then slashed with a blade before the offenders stole his mobile phone and fled the scene.
He was taken to hospital for treatment but police said his injuries were “not thought to be life-threatening”.
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Detectives on Thursday (November 17) launched a public appeal for information.
“We want to hear from anyone who was in Avenham Park and the surrounding areas at around 7am on Monday morning,” a spokesman for Lancashire Police said.
“Did you witness anyone acting suspiciously in the area?
“If you can help, contact police on 101, quoting the log number 1207 of the 14th November 2022 or email [email protected]”