SIR Bobby Robson has revealed that he is fighting cancer for the fifth time in 15 years.

The former England manager still took his seat in the stands on Saturday to watch his beloved Newcastle United.

But he later revealed his new agony and vowed "I will battle as I have always done."

The 74-year-old started chemotherapy treatment last week, the first session in a six week course to counter small cancerous nodules in his lungs.

The former Toon boss said he would try to carry on with his life as normal and plans to attend his annual charity golf day in Portugal.

He also plans to celebrate his 52nd wedding anniversary next month with his wife Elsie, - sons Paul, Mark and Andrew and his four grandchildren.

Sir Bobby said: "Of course, it's not the greatest news I've ever had but I have fought hard throughout my life and I will continue to fight. I will battle as I've always done.

"My last operation in August was a success but this time the doctors have said they can't operate.

"The good news is that they are measuring the nodules in my lungs in millimetres rather than centimetres.

"That is encouraging and we are hopeful the treatment will keep it under control.

"I've been advised to keep busy and active, and that's what I will be trying to do whenever possible."

Sir Bobby, the son of a Durham miner, was knighted in 2001.

He won 20 England caps as a player - including playing in the 1958 and 1962 World Cups - and taking the team to the 1990 World Cup semi-finals during his eight years as the national manager.

In February, asked why he is still passionately involved with the game, he said: "My wife wants me to go to Tesco's on Saturdays, but I just couldn't. I need the drug."

Sir Bobby sat with Newcastle chairman Freddy Shepherd as they saw the Magpies go down 2-0 at home to Blackburn Rovers.