The dear pal told how the 76-year-old is now too ill to go on his favourite lakeside walk after being diagnosed with pancreatic cancer.
The terminally-ill former Manchester City manager revealed in January that he had been diagnosed with the disease.
His inspirational life has been chronicled in a documentary for Amazon Prime Video which was released on Friday.
Speaking to The Mirror, close friend Runebjer said as cited by Sports Central: "I've seen Sven and how do I feel? I feel sad but I am happy to have known Sven and know that I can still see him. This is my reaction. "He is such a tremendous person. "Lake Fryken is beautiful. It is 90 kilometres long from south to north and it is a beautiful landscape. You can see that in the pictures. You can definitely fish in that lake too. "But sadly his condition does not allow Sven to do that any more. It is a hard time for him."
Sven spoke about Lake Fryken in his documentary and was filmed sitting by the beautiful body of water.
He said: "I always thought this is a great place to sleep. "The ashes could be thrown into the water here."
The director of Sven's documentary revealed that the former footballer left those working on the project in tears as he recorded his final goodbye in a room alone without a cameraman.
Claudia Corbisiero, director, said; "He was always open, but I think it just took time to get him to be really open about his illness and the way he felt about it. "Sven also really wanted to make sure that this wasn't only a sad story. "And that was something that he was really keen on, is 'I don't want this to be a boo hoo. I'm dying' thing.'"
Sven was too ill to fly to London earlier this week to promote the documentary.
His daughter Lina said on stage in London he is now "deteriorating quite quickly".
The ex-England manager gave a final message to former players, coaches and supporters after speaking openly about his affairs and life in the film.
In a touching clip at the end of the documentary, Sven told viewers: “I had a good life. I think we are all scared of the day when we die, but life is about death as well. "You have to learn to accept it for what it is. Hopefully, at the end people will say, yeah, he was a good man, but everyone will not say that. “I hope you will remember me as a positive guy trying to do everything he could do. Don’t be sorry, smile. "Thank you for everything, coaches, players, the crowds, it’s been fantastic. Take care of yourself and take care of your life. And live it."
The film then pans back to Sven in his home, with the former England manager concluding his message with "bye".
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