Emergency services were called to Glenavon FC in Lurgan just after midnight.
A teenager has been arrested following a stabbing at a soccer club in the North.
Emergency services were called to Glenavon FC in Lurgan just after midnight.
An 18 year old man was subsequently taken to hospital for treatment to serious head injuries.
The PSNI says an 18 year old man, who was arrested, remains in custody.
Police also say they're aware a lot of people were in the club around the time of the incident, and so are appealing to anyone with information to come forward.

Kfm Recruiting for Advertising Sales Dept.
Five Hospitalised After Arson Attack In Finglas
Gardaí Warn Drivers After 150 Caught Drink or Drug Driving Over Christmas Period
An Garda Síochána Release Image of Getaway Car Found Burnt Out In Naas Used In Fatal Offaly House Fire
Pedestrian Dies After Collision On R445 Monasterevin Road Outside Kildare Town
Fine Gael TD Calls For Restricted Bin Collection Times To Ease Traffic Delays
Gardaí Continue Their Road Traffic Enforcement Operation Throughout The Christmas Period
New Quality Mark To Be Introduced To Crack Down On Bogus English Language Schools