With the sum of the transfer set to eclipse £50million, City have shelled out a world-record fee for a full-back, taking Spurs' starting right-back from them despite the Lilywhites having finished above the Citizens last season.
Citizens gain much needed right-back
Signing a five-year-contract, Walker is expected to fit straight into Pep Guardiola's line-up for the 2017/18 season, with City looking to compete on multiple fronts.
After the post-season departures of Bacary Sagna and Pablo Zabaleta, a right-back was always at the top of Guardiola's wishlist and he'll have been delighted to finally get his man.
That left Walker as the obvious alternative, City very willing to shell out the big bucks in order to poach him from a direct rival, giving their fans bragging rights over those in North London.
Spurs getting good fee for 'thrilled' Walker
Still, Tottenham are getting a very good fee for a player who they signed for pittance from Sheffield United in 2009. The Blades are set to benefit themselves from the transfer, picking up 10% of the fee.
After the deal was announced, Walker told Manchester City's official website; "I am thrilled to be signing for City and can't wait to get started.
"Pep Guardiola is one of the most respected managers in the world and I feel he can help me take my game to a new level."