Aston Villa have completed the signing of French international left-back Lucas Digne from fellow Premier League side Everton.
Financial details were not disclosed, but Sky Sports had previously reported that the deal was worth between Stg20 million ($A37.5m) and Stg25m ($A47m).
Digne, 28, joined Villa after three-and-a-half years at Everton, where he made 127 appearances in all competitions, recording six goals and 20 assists.
Digne's arrival at Villa Park further highlights the club's ambitions under Gerrard, as he was boosted by the loan signing of Brazil international Philippe Coutinho from Barca last week.
"When Lucas became available, we jumped at the opportunity to bring him to the club," Villa manager Steven Gerrard said.
"Signing a player of his pedigree and quality in the January window is a great addition to our squad and his arrival excites me and everyone associated with Aston Villa."
Villa are 14th in the Premier League standings with 22 points from 19 matches and seventh-placed Manchester United on Saturday.
Digné, who was capped 43 times by France, last played for the Toffees on 1 December, losing to Liverpool in a 4–1 home Merseyside derby - after an outing with manager Rafael BenÃtez over strategy and his role in the team. .
Regarding his exit from Goodison Park, Digne said: "Only a year ago I signed a new contract with the ambition to stay at this club longer... I didn't expect it to end like this. "
"What has happened and some of the things that have been said about me in the past month have made me very sad. But I will not enter into a war of words with anyone."
Benitez criticized Digne's attitude, saying: "We are paid big money to do our job and if someone is happy or not it's (still) your work to perform in."
Digné spent two seasons at Barcelona and played 46 times for the club, winning La Liga and the Copa del Rey before leaving in 2018.
He previously played for Ligue 1 side Paris Saint-Germain, where he won two league titles.