Dunne has been capped more than 50 times for the Republic of Ireland
Aston Villa have confirmed the signing of Manchester City's Republic of Ireland defender Richard Dunne.
Villa have agreed a fee of £6m with City and finalised personal terms with the 29-year-old on a four-year deal.
The Premier League asked for more time to ratify the deal despite Villa submitting the relevant forms before Tuesday's 1700 BST transfer deadline.
"Hopefully I can be part of a squad to challenge for a Champions League spot," the centre-back told Aston Villa TV.
"With the experience gained from last season and with the new players brought into the squad this year, maybe it might help us go that bit further."
Dunne, who spent nine years at City, becomes Villa's seventh summer signing and takes their spending to £40m.
Villa have also recently signed full-back Stephen Warnock from Blackburn and completed a deadline-day deal for West Ham centre-back James Collins to strengthen their defence following the retirement of Martin Laursen and the sale of Zat Knight to Bolton.
Club skipper Stiliyan Petrov said: "He's the captain of Ireland, he's been the captain of Manchester City. You love to see players like that coming to this club.
"Martin Laursen was a big player for us, with his presence and his influence. But he, like Gareth Barry, is now gone and we need to get on without him.
"The arrival of Dunne will help us to do that."
There had been speculation surrounding Dunne's future at City following the arrival of defenders Joleon Lescott from Everton and Kolo Toure from Arsenal in big-money deals.
Dunne played in City's first two games of the season but was replaced in the side with Lescott once the England man had completed his £22m transfer.
The centre-back has had a chequered career at City since joining them from Everton in 2000.
In his first season, the club were relegated to the second tier and then in 2002 he escaped the sack but was suspended and fined £20,000 for arriving for training in a poor state.
Dunne underwent an intense training regime and regained his place in the City side. He went on to receive the club's player-of-the-year award for four consecutive seasons, and at the start of the 2006-07 season, Stuart Pearce appointed him as captain.
Dunne was on the pitch for every minute of every game that season, both league and cup, and went on to land fans' player-of-the-season honours for the third successive time.
Villa have also added Stewart Downing, Fabian Delph, Habib Beye and Andy Marshall to their squad this summer.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.