La Trobe Crime Investigation Unit detectives are appealing for witnesses following a fire at a tennis club in Newborough overnight (31 December/1 January), Victoria Police say.
It is believed an unknown person forced entry to a tennis club on Monash Way and lit a fire inside causing extensive damage.
Police believe the same person forced entry into a neighbouring premises and attempted to start a fire unsuccessfully.
Investigators are keen to speak to any witnesses and are hoping to speak to anyone who may have noticed any suspicious behaviour leading up to the fire.
Anyone with information is urged to contact Crime Stoppers.