Businesses across the county can show their support by participating in a friendly "flag off" challenge set by Limerick Chamber to see which county has the best supporters.
There are also calls by many associations to turn Cork into a sea of red and white to ensure the rebel county secures victory both on and off the pitch.
Cork Chamber are asking everyone to display Cork flags, lighting and signs in their workplace and post pictures online using the #LimerickvCork hashtag and tagging @Corkchamber and @Limerickchamber.
