His family continue to keep vigil at his bedside, as his wife Dwina said music appeared to be helping.
She said his brother had been singing to him, while his children played music to “try and bring him back to us”.
The Sun newspaper has reported a “source close to the 62-year-old music legend” as saying there have been hopeful signs of recovery but that he was “not out of the woods yet.”
The source said: “There were flickers of life from Robin. His eyes moved and there was an attempt at speech.”
The singer has been in hospital in Chelsea, west London, since he lost consciousness last week, after contracting pneumonia in his fight against cancer.