Michael Schumacher ace has holes drilled in his skull in second operation after skiing accident leaves him in a coma

Surgeons battle to save Michael Schumacher: F1 ace has holes drilled in his skull in second operation after skiing accident leaves him in a coma

• Seven-time world champion fell in Méribel resort in French Alps
• Medical sources say F1 star was suffering from a brain haemorrhage
• Schumacher, 44, was skiing off-piste with his 14-year-old son Mick
• The skiing enthusiast was wearing helmet and hit head on a rock
• But in a report filed at 7.20pm doctors said his condition had 'worsened'
• Surgeon specialising in brain injuries arrived last night to assess him
• The German, who retired from sport in 2012, was 'one of best drivers ever'

Seven-time Formula One champion Michael Schumacher is in a critical condition after undergoing a second brain operation following a skiing accident that has stunned drivers, fans and athletes around the world.

The Grenoble University Hospital Center said the retired racing driver arrived at the clinic in a coma on Sunday and underwent immediate surgery for a serious head trauma. 

He then underwent a second procedure in which surgeons reportedly drilled holes in his skull to relieve pressure on his brain as they battled overnight to save him.

A medical source confirmed today that the 44-year-old was in a 'critical state' and that his health had 'not improved' following a brain haemorrhage.

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Critical: Seven-time Formula One champion Michael Schumacher (pictured on the slopes in 2006) has undergone emergency surgery after suffering a brain hemorrhage in a skiing accident in the French Alps

Risky: The retired racing driver hit his head on a rock while skiing off-piste with his 14-year-old son Mick (believed to be pictured, above, with his father) in the resort of Meribel on Sunday

Schumacher and his wife Corrina attend the Asterix At The Olympic Games Paris premiere in Paris in 2008

Treatment: He was airlifted to the Centre Hospitalier Universitaire hospital in Grenoble, French Alps

Schumacher's agent on critical nature of F1 champ's condition

It was not clear whether he was still in a coma but the hospital statement, which was signed by a neurosurgeon, an anesthesiologist and Marc Penaud, the hospital's deputy director, said 'he remains in a critical condition.'

Schumacher fell while skiing off-piste in Meribel in the French Alps on Sunday morning and hit his head on a rock, according to a statement from the resort. 

Resort managers said he had been wearing a helmet and was conscious when rescuers first responded to the scene.