MADRID - Manchester City have moved to bolster their defence by signing Argentina centre back Nicolas Otamendi from Valencia on a five-year contract.

Otamendi, 27, a fierce tackler who is also strong in the air, will link up at City with fellow internationals Sergio Aguero, Martin Demichelis and Pablo Zabaleta, as well as former Porto team mates Fernando and Eliaquim Mangala.

His arrival lifts the number of Argentines at the Abu Dhabi-owned English Premier League club, who are coached by Chilean Manuel Pellegrini, to six including Willy Caballero and Bruno Zuculini.

Valencia also confirmed the deal on their website. Neither club disclosed financial terms, though Spanish media reported the fee was around 45 million euros ($50.14 million).

"Nicolas Otamendi was arguably the best defender in La Liga last season and so naturally I’m delighted to have added a player of his quality," Pellegrini said.

"He is an established international for one of the best nations in world football and I have no doubt that he has the right mentality to fit into a squad where he will find many familiar faces," added the former Real Madrid, Villarreal and Malaga coach.

"As a footballer, Nicolas has all of the qualities to be a success in the Premier League -- he's strong, he's excellent in the tackle and he's very good technically.

Otamendi joined Porto from Velez Sarsfield in 2010 and won the domestic league three times in his four years in Portugal, as well as the Europa League and the Portuguese Cup.

Then-coach Diego Maradona called him into the Argentina squad for the first time in qualifiers for the 2010 World Cup and he made his debut aged 19 against Panama.

He has made 25 appearances overall for Argentina and played at the 2010 World Cup but missed out on the finals in Brazil last year.

At this year's Copa America in Chile, he helped Argentina finish as runners-up, playing alongside Demichelis in the semi-final and final.

"I am here to give my best, to fight game by game and push City to the highest peaks for as long as possible, and I wish we will be able to win several cups and titles," Otamendi said.