Former England boss Sir Bobby Robson says surgery on a brain tumour left him unable to stand up and left him fearing for his future in football.
Sir Bobby Robson still wants to be involved in football
The Republic of Ireland's consultant had surgery in August that left him without the use of his left arm and he still feels effects from the treatment.
"After surgery I knew from a health point of view I wasn't going to be in the best situation," said Robson, 73.
"I could not even stand up and I could not move my left arm."
However, Robson insisted that he still wanted to be involved in the game.
"I did not want to retire. I have been involved in football for over 50 years and I want a few more in it yet," said Robson, who is also honorary president of his former club Ipswich Town.
"I knew how much I wanted to come back but also realised there was a chance I couldn't.
"I am three-quarters of the way there now and I want to get back to 100 per cent. Even now, if I lift my left arm 10 times I am tired.
I just knew I had to come back now because I knew it would be good for me
"I have neuro-physiotherapy every day. It takes an amazing amount of energy to fight back.
"I have basically had to regenerate my brain to teach my arm and leg to work again.
"But I have got my speech and I still feel competent in my head."
The Republic of Ireland are set to face San Marino for a Euro 2008 qualifier in Dublin on Wednesday qualifier and the former Newcastle manager is adamant the time is right for him to return to work.
"I just knew I had to come back now because I knew it would be good for me," he stated.
"The reason I took this job with the Republic of Ireland was to have another couple of years in the game at the top level."