"I've been to look at the ground and it's absolutely unreal. It's mind blowing.
"If I get the chance to play in it and do well I'll be really chuffed with myself."
The midfielder, who made his England Under-21 debut last year, rose through the ranks at Elland Road and was a regular for United last season.
He signed a new four-year deal with Leeds in September last year, but continued to attract interest from Premier League clubs.
Manchester City admitted their interest in the player while Everton were also thought to be interested.
A Leeds statement said: "Leeds United wish to place on record our appreciation for the honourable manner in which Aston Villa have conducted their interest in the player.
"The club has resisted approaches from other FA Premier League clubs since agreeing terms with Aston Villa.
"Having given Villa our commitment to transfer the player (subject to a medical), we had no intention of going back."
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