Joe Root is available for the first ODI match between England and Australia in Melbourne on Sunday. England's Test skipper recovered from a viral illness. However, Australia will miss their opener David Warner who is out by a stomach bug.

Root was hospitalized on the final morning of the fifth Ashes Test in Sydney with gastroenteritis but England ODI skipper Eoin Morgan said he would play in the series opener in Melbourne.

"Joe is good and should be fit to play tomorrow," Morgan told reporters on Saturday.

"He's extremely important. He's been a fantastic leader within the group and, on top of that, there's the weight of runs he's scored and the manner that he's scored them. He's obviously a key part. He's a very versatile player and can score in any strike-rate that needs to be required, given the situation."

But while Root was in better health, Australia vice-captain Warner missed the team's final training session on Saturday and instead walked laps of the Melbourne Cricket Ground.

"I think he's okay, he was having a bit of a gastro issue yesterday," skipper Steve Smith told reporters.

"He turned up here today and walked the oval a few times. He said he'll be fine so I don't think there'll be any trouble there."

England will be walking in with some positives, as they won the tour match on Thursday against Cricket Australia XI by 5 wickets. Alex Hales made a half-century on his return to the side and skipper Eoin Morgan led the tourists to a five-wicket victory with an unbeaten 81 in Sydney.