Peter Siddle unfazed by England troubles

Peter Siddle has insisted that England's current problems off the field is none of Australia's business.

Spinner Graeme Swann announced his immediate retirement from cricket on Sunday with England 3-0 down in The Ashes, which has led to criticism in some quarters due to the fact that there are two remaining Test matches to play Down Under.

"All I can speak for is us," Siddle told reporters. "It's every boy's dream in Australia, all I ever wanted to do was get the Baggy Green.

"To achieve that is everything I could have hoped for. There's nothing else I want to do. It's something we cherish a lot.

"I guess it was time for Swanny. He felt his time was up, [but] he's had a great career. I've enjoyed my time playing against him. He's always been a big challenge."

The fourth Test gets underway at the MCG in Melbourne on Boxing Day.