Across the city, Manchester United have recruited Ander Herrera as their big-name import so far, though he's not likely to be the last as Louis van Gaal re-shapes the squad for a top-four challenge.
Herrera is everything you'd expect from a modern La Liga midfielder: technically sound, confident on the ball with a good passing range; he also has a tenacious side that sees him happy to work hard defensively, making challenges and pressing opponents.
The former Athletic Bilbao man can play a range of roles through the centre from a deep controller to a creative No. 10, but United's 3-5-2 system will dictate that he plays something rather in-between both.
Manchester United open the season against Swansea City and, with regard to Herrera, that's probably as perfect an opener as he could have wished for: a technical side, not overly aggressive and, in truth, not really that good.
Herrera will play as the dictator of the team's tempo and direction, constantly receiving the ball in the centre of the park, turning and playing in a team-mate, before making himself available in space once more. He'll be the metronome, the player the three centre-backs search for in possession and the man to find the rotating Juan Mata and Wayne Rooney, dropping deep to instigate attacks.
He could look great in some games and anonymous in others if you don't watch him closely, but Herrera will certainly play a big part for Van Gaal's side this season.