NEWCASTLE United skipper Alan Shearer has flown to America in a desperate bid to find a solution to the long-term knee problem which has cast a shadow over his future, writes CLIVE HETHERINGTON.

Shearer admitted he was "destroyed" when he broke down in a practice match nearly two weeks ago, only a fortnight after making his comeback.

Now the former England captain has booked into a clinic in Colorado as concern grows about the extent of the injury that has dogged him since before Euro 2000.

The 30-year-old striker is seeing the world-renowned knee specialist, Dr Richard Steadman, for treatment and therapy.

Shearer was out for nine weeks after an operation at Christmas, and it is unclear whether he faces further surgery while in the States.

United yesterday released a statement, saying: "Alan has undergone initial tests and is due to meet again with Dr Steadman later today.

"It is not known at this stage whether another operation will be required or whether rest will be advised.''

Steadman's clients include Brazilian superstar Ronaldo, whom he has helped this season, and Liverpool duo Jamie Redknapp and Patrick Berger.

"There is a feeling that if anybody can help Alan, it's Dr Steadman,'' said a United source.

Manager Bobby Robson was delighted when talisman Shearer returned to action in the home defeat by Manchester City.

But he figured only once more, in the draw at Everton, before pulling up with a recurrence of the tendinitis trouble that forced him to have surgery.

The setback undoubtedly hit Shearer hard and renewed fears that he could be out for the rest of the season - if not longer.

And the secret trip to the States underlines how seriously Newcastle regard the situation.

However, they remain confident that Shearer will eventually regain full fitness.

Coach Mick Wadsworth insisted: "I can categorically deny that Alan's career is under threat.

"That has not been mentioned or thought about.''

Robson said: "The problem is linked to where the trouble was before, but we don't think it's a lasting one.''