Shearer and Roeder worked together at Newcastle in 2006

"Alan is a future Newcastle manager, and he might well be the next one," the Norwich boss told BBC Radio 5 Live.

"All on his own, without an experienced backroom team, I think the job would be very difficult.

"But if he appointed a very experienced backroom team to help him get through the first few seasons, then I believe Alan would be a winning manager."

Interview: Portsmouth boss Harry Redknapp

Roeder, who resigned as Newcastle boss in May 2007, managed Shearer as the striker's playing days ended in 2006.

Speculation surrounding the job is rife following the shock exit of Sam Allardyce on Wednesday, with former boss Kevin Keegan also linked with the role.

And after Harry Redknapp rejected the chance to move to St James' Park, the Portsmouth manager voiced his belief that Shearer is the ideal for the role.

606: DEBATE Have your say on who Newcastle should appoint as their next manager

"I'd give Shearer the job. I think he's perfect for it," he said.

"He'd set the place alight and the fans love him. Experience doesn't matter - he understands football.

"He would just need to bring a couple of experienced people in alongside him. It wouldn't be a problem for him."

Redknapp added: "We're kidding ourselves that experience is what is needed. [Sunderland manager] Roy Keane had no experience but he knows what he's doing. He's different class.

"I listen to Roy, I watch him and there's only one place he's going and that is right to the top. I don't see why Alan can't do that.

"Because of what he means to the place and what the fans think of him and what a player he's been, he'd be absolutely perfect."

You do need some experience, otherwise you are learning on the job Steve McClaren Former England manager

But life president and former Newcastle chairman Sir John Hall told 5 Live's Sportsweek programme that the Toon Army's idol was not ready to fill the hotseat.

"Alan is the most dedicated professional I have ever met and a great man. But he would want to come in at the right time, and now is probably too early," he said.

Hall added he could not envisage former team boss Kevin Keegan returning, even with Shearer alongside him.

"Kevin has had his time and I don't think he and his family would want to return."

Former England manager Steve McClaren is another who feels that the time is not right for Shearer to become Newcastle manager.

"You do need some experience otherwise you are learning on the job," he said.