All-rounder Joe Denly confirmed on Tuesday that he would drop to number four in the batting order for England's opening Ashes Test against Australia, with captain Joe Root replacing him at number three.

Root has previously made clear he prefers batting at four but the skipper is understood to have approached England coach Trevor Bayliss after last week's Test win over Ireland about returning to his old position when the Ashes opener starts at Edgbaston on Thursday.

Although England beat Ireland by bowling out the visitors for 38 in their second innings at Lord's, they only managed 85 all out themselves in their first innings.

Bayliss has long wanted Root, England's best batsman, to bat at number three following a succession of top-order collapses that have seen the skipper walking out to bat at four when two cheap wickets have fallen.

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Root averages 48 at number four in the order but a shade over 40 when batting at number three.

But with England openers Jason Roy and Rory Burns having played just eight Tests between them, the logic in having 81-Test veteran Root bat at number three is clear.

"Joe Root will bat at three and I'll be batting at four,” Denly said at Edgbaston on Tuesday. “He rang me the other day and told me he wanted to bat three and for me to go in at four. I think Rooty just wanted to get involved in the game, get up there and get out in the middle."

"I'm very excited. I wasn't too fussed about where I'd bat as it's just great to be in the eleven. I've batted at four before for Kent and throughout my career, so it really wasn't a big issue," he added.

Denly may be 33 but the Kent batsman has played just three Tests and this will be his first Ashes series.

He had a brief stint as a limited-overs international a decade ago but it seemed Test cricket had passed him by.

However, a return to form and the arrival of his former Kent teammate Ed Smith as national selector saw him given a Test debut against the West Indies in Antigua earlier this year.

"Everyone from a young age dreams of playing in an Ashes series and to finally get that chance, being quite an old campaigner, I'm certainly excited and up for the challenge," he said. "There's no doubt that the Australian bowling line-up is one of the best in the world. They have all bases covered really and, as a top-order batter, that is where you want to be, testing yourself against the best."

Denly just missed out on a place in England's triumphant World Cup squad, being replaced by Hampshire spinner Liam Dawson, who did not play a game.

"I think it was the right decision," he said. "I thought it might happen and it was a great opportunity for me to go back and play some red-ball cricket with Kent and get some good form going into this series."