Ballina Rugby Club has asked members of the public not to enter or use its club grounds.
The club has closed its grounds to the public as part of measures to prevent the spread of Covid-19 yet members have found people are still using the facilities.
Describing the matter as extremely serious and urgent, a spokesperson for Ballina Rugby Club said: “Despite our best efforts, people of all ages continue to enter and use our club grounds. This is completely and utterly without our permission and against our expressed wishes. Nobody is allowed on our grounds at the moment.”