Mangala, 23, was an unused substitute for France at the World Cup finals and arrives at City hoping to dislodge Martin Demichelis and join captain Vincent Kompany in the heart of Manuel Pellegrini's defence.
The deal had been mooted for months - with City reportedly in talks as far back as January - but has finally been concluded to make Mangala City's sixth signing of the summer, including his former Porto team-mate Fernando.
Mangala began his professional career with Belgian club Standard Liege before joining Porto as a 20-year-old.
In addition to winning a league title and a cup in Belgium, Mangala secured two league titles with Porto when making 92 appearances for the club.
HOW MUCH DID HE COST?
It was reported in the English media that Mangala cost City £32m but Porto confirmed to the stock market that City paid €30.5m (£24.3m) for their 56.67% share of the defender. He was partly owned by a third party called Doyen Sports (illegal in English football), and if their stake was given a similar value, then in total Mangala's cost is actually in the region of €54m (£43m).
That fee would make him the second most expensive defender of all time behind David Luiz, who this summer joined PSG for a fee of £50m. While only Porto's segment of the fee has been confirmed, it seems rather unlikely that Doyen Sports would sell their stake for anything less than market value.
FOOTBALL 2014 Porto - Mangala
WHAT DID HE SAY?
Mangala told the club's official website: "City is a top club in Europe. For me, it was an important step to leave Porto and join Manchester City in order to continue my progress. I want to win titles and I believe I can do this.
"I am ambitious and this is why I am here. I’m very happy to come to England because for me, the Premier League is the best league in the world. It is a very intense and very aggressive competition. There are plenty of goals, so it is also really nice to watch and I can’t wait to get started!
"The fact that Fernando is here is better because I played with him at Porto but there is also other players that I know like [Bacary] Sagna, [Gael] Clichy and [Samir] Nasri."
WHAT DID PELLEGRINI SAY?
Pellegrini said: “I’m delighted to have added a player of Eliaquim’s quality in the squad ahead of the new season.
“He is already a fine player but in my opinion, he has all of the mental, physical, technical and tactical attributes to become one of Europe’s very best defenders.
“Eliaquim is a player I believe will make an immediate impact in the Premier League, thanks to his physicality, his reading of the game and quality on the ball. I think he will prove to be a great signing for us.”
Mangala is a player of some potential and there does look to be a spot available in the City backline given Demichelis's struggles last season and the regression of Matija Nastasic. If Mangala can slot in straight away then City could be an even more formidable force as they go about defending their title. Still, £43m seems an extortionate amount, even if Porto are the kings of extracting maximum value for their players.
WILL MAN CITY LINE UP LIKE THIS?
Man City line up
THE VIEW FROM FRANCE
Martin Mosnier, Eurosport France: "Mangala was in Didier Deschamps’ France squad for the World Cup, but didn’t play one minute. However, he is rated as one of the best emerging centre-backs on the planet, and could be the long-term future of the City defence.
"Such a big fee for a relatively unproven player (three caps with French squad, 19 games in the Champions League), is a huge risk. He is the second most expensive defender of all time (or most, if you believe reports David Luiz cost only £40m) and could be the biggest test of Manuel Pellegrini’s credentials in the transfer market so far.
"The Premier League is the perfect league for him. He is strong, powerful, athletic, very efficient in the air. He has to progress and has some tactical issues. But he’s still young."
- Sports & Recreation
- Manuel Pellegrini
- Premier League
- Manchester City
- Martin Demichelis