Since joining Betis in 2019, Moreno has made 122 appearances, scoring six goals and making 14 assists. He won the Copa del Rey with the club last season.

"Alex is a good player that can help our squad," Villa coach Unai Emery said.

"He has been one of the top left backs in LaLiga over the past few seasons and we are delighted to have him here."

Moreno also had spells with Mallorca, Elche and Rayo Vallecano.

Aston Villa are 11th in the Premier League and host Leeds United on Friday.