Seve Ballesteros will undergo a third operation tomorrow to ease the swelling on his brain although hospital authorities insist he remains in a "stable condition".

The 51-year-old five-time major winner has had two operations on his brain since the diagnosis of a tumour earlier this month and is being kept under sedation at the Hospital Universitario La Paz in Madrid.

Ballesteros' condition was reported to be improving on Wednesday but doctors have now decided to operate on him again.