The fee was undisclosed, but British media reports said it could rise up to £58 million with incentives.
“I think this is the most important thing for the club, the players and for the fans of course”.
He scored twice in 13 appearances and 10 goals in 33 games in two separate loan spells at Genk and German club Werder Bremen respectively, during his two-year spell at Chelsea.
The 33-cap Belgium global struggled to secure regular football at Stamford Bridge, however, and moved to Wolfsburg with Chelsea’s manager Jose Mourinho saying he had been “an upset kid, training very bad and not ready to compete”.
With Andrea Pirlo and Arturo Vidal having departed, last year’s Champions League finalists need more creativity in midfield, and could grant Nasri a more central role should he agree to a move.
Earlier this summer City landed Raheem Sterling from Liverpool in a deal that could be worth up to £49milllion and also signed Fabian Delph from Aston Villa and Nicolas Otamendi from Valencia for £32m.
After the deal was completed on Sunday, Allofs said: “We would have loved to carry on working with Kevin, but we decided to accommodate his wishes of moving to Manchester City now”.
“We like to play attractive, attacking football and bringing in a player like De Bruyne will only aid us as we fight on four fronts”.
Given City’s previous expenditure, amortisation would normally add up to a lot, but the biggest spree in City’s history, of around £153million, came in 2010-11.