Police are appealing for witnesses after a member of staff at Farmfoods in Wick Street was punched as he took a delivery from a lorry to the store.
It happened in Wick between 6.45pm and 7pm on Friday, May 20.
The victim suffered injuries to his face requiring hospital treatment.
Enquiries are ongoing and anyone who saw what happened, or who may have any other information to support the investigation, is asked to contact police online or by calling 101 quoting serial 1124 of 20/05.