Institute's changing room at their Riverside Stadium was torched last night.
The PSNI have confirmed that they hunting arsonists after Friday evening's attack at the Drumahoe ground.
Inspector Louise Cummings said: “Police are treating this fire as suspicious at this time and I would appeal to anyone who noticed any suspicious activity in the area to contact Police at Strand Road on the non-emergency number 101, quoting reference 1407 22/06/18.
Fifteen firefighters were required to bring a fire at Institute's disused ground. The blaze started at an oil tank near the changing rooms behind the 'Billy Kee Stand'.