Gardai in Loughrea are investigating a single vehicle serious traffic collision that occurred outside the town early this morning.
The collision occured on the N66 Loughrea to Gort Road, approximately 3km outside the town at 4:30am.
A male aged 20 years was seriously injured when the car he was a passenger in collided with a ditch.
He was taken to University College Hospital Galway where he remains in a serious condition.
Both the driver and the second passenger were uninjured.
The road is closed to traffic and diversions are in place.
Forensic collision investigators have been notified.
Anyone with information is asked to contact Loughrea Garda Station.