The 25-year-old English midfielder joins Pep Guardiola’s side on a six-year deal after the Premier League champions activated the release clause in his Villa contract.
The Tottenham Hotspur captain expressed his desire to leave at the end of the last campaign after another trophyless season.
Walker was the oldest player in the England squad, with his pace vital in helping prevent opponents get in behind the defence.
Guardiola downplays Manchester City's chances of acquiring a replacement for Sergio Aguero, claiming that high transfer fees make such a move "impossible."
Messi, 34, is technically a free agent as of July 1, with his contract running down before Barca could finalise terms on a new deal.
The scare surrounding Christian Eriksen is certainly not an isolated one with Indian football witnessing a similar scenario in the quarter-finals of the 2018-19 edition of the U-18...
Needing to win, Spain were heading out as they entered added time 3-2 down; then came an incredible comeback.
Elsewhere, Manchester United host Leeds United, while Liverpool visit Norwich City on an interesting opening weekend.
The 21-year-old English sensation clinched this award after helping Manchester City to title glory in a memorable 2020-21 campaign.
Apart from guiding Manchester City to a league title, Pep has also helped them win the Carabao Cup and reach the Champions League final this season.