(BBC) – Australia captain Ricky Ponting says England may be better off without Andrew Flintoff in their Ashes side, unless the key player is 100% fit.

Ponting said Flintoff was not the force he had been in 2005 when he led England to a 5-0 defeat in Australia 18 months later after an injury comeback.

“Flintoff is obviously very important to England’s set-up,” said Ponting.

“Maybe, as we saw in 2007, if he’s not 100% fit then maybe that sort of impact he can have is not there.”

Ponting, whose team are currently based in Nottingham preparing for the ICC World Twenty20, begin their five-Test Ashes defence on 8 July.

He was happy to give his views on Flintoff, who tore knee cartilage while playing in the Indian Premier League in April – and was subsequently ruled out of all England’s international cricket until the Ashes.

Whether or not to field Flintoff in the first Test at Cardiff – perhaps on the back of just a game or two for Lancashire – will be “the great decision the England selectors are going to have to make,” said Ponting.

“In 2005 and in 2007 we saw two completely different players and that had a lot to do with the level of fitness that he had under his belt going into each series.

“That’s where they’re going to have a tough decision to make.”

Ponting said he felt “relaxed, fresh and rejuvenated” after a four-week break from cricket.

And after team-mate Michael Hussey complimented England’s new-found strength in depth, the Aussie skipper said his team would pose a severe challenge to the host team this summer.

“England played some very good cricket against the West Indies but the competition and opposition they’ll be coming up against us is vastly stiffer than what they’ve faced in the last few weeks.”