A teenage British tourist is reportedly fighting for his life after being found floating unconscious in his holiday pool in northern Portugal.

The 15-year-old is said to have been rushed to Braga Hospital in a “critical condition.”

He is understood to have been staying with his family at an unnamed rural tourism establishment in the quaint village of Aborim in the municipality of Barcelos.

The village has a population of just under 900 inhabitants.

Firefighters are said to have been among the emergency responders mobilised and an ambulance was also sent to the scene which took the teenager to hospital after he was stabilised.

Relatives reportedly sounded the alarm just before 5pm yesterday when they discovered him in the water.

Portugal’s GNR police force was also notified and began an investigation.

Volunteer firefighters based in Barcelos, who responded to the emergency, said early this morning they weren't authorised to give out any information on the incident.

The GNR police force couldn’t be reached for comment.

Last month British friends King Edonmi, 29 and Mo Lisau, 27, were discovered lifeless in their Albufeira hotel pool.

Portuguese police sources subsequently said ahead of post-mortems they believed the design of the pool combined with the fact they couldn’t swim had likely led to their deaths.

In the early hours of August 9 a British family were killed in a crash hours after they flew to Portugal from their UK home and rented a hire car at Faro Airport on the Algarve to start their holidays.

Domingos Serrano, 55, his wife Maria, 51, and their 20-year-old twin sons Afonso and Domingos, all British passport holders according to police, died in the fireball accident as they headed north towards the town of Mourao where the boys' parents were born before emigrating.

The 19-year-old Polish-born girlfriend of one of the twins, identified only by her first name Veronica, also died in the accident along with 26-year-old mine worker Ruben Goncalves who was driving the car their rented Nissan Juke collided head-on with on a bend on the IP2 main road.