Australia's fast bowling spearhead Glenn McGrath has sounded an ominous warning to one-day international rivals Sri Lanka and South Africa, saying he is back to his best.

Ahead of Friday's tri-series cricket opener against Sri Lanka in Melbourne, the 35-year-old believes he has returned to the form he was in prior to the freak ankle injury which disrupted his Ashes tour.

While the wickets haven't exactly been flowing freely of late - 24 in his past seven Test matches while Shane Warne and Brett Lee have dominated - McGrath believes the one-day series and upcoming South African tour will herald a change of fortune.

"I probably haven't been 100 per cent happy with my bowling - it probably wasn't until the last one and a half Tests that I've sorted it out." McGrath said.

"I know when I'm feeling good and bowling well, the wickets are just around the corner.

"I'm back there now.

"In the last Test match in Sydney, I probably feel I'm back to where I was at Lord's (the first Ashes Test in which he was man of the match).

"I'm definitely looking forward to what's ahead."

McGrath and his teammates trained on Wednesday at Telstra Dome - the venue for the opening one-day match.

It was also a chance for McGrath to meet Australia's newest international fast bowler - West Australian giant Brett Dorey.

The two had not met until they came together in the dressing rooms prior to Wednesday's session.

The 203cm 28-year-old received a surprise call-up to the one-day squad and may yet line up alongside McGrath in Friday's day-night match.

Skipper Ricky Ponting missed the session after being given the day off.

After playing Sri Lanka, the Aussies back up against South Africa on Sunday in Brisbane before returning to Telstra Dome on January 20 to again take on the Proteas.

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