Kompany has gone, who will replace him at City?
City have had a tremendous season, backing up their 'centurions' season with a superb Premier League victory, in which they held off Liverpool to claim the league with 98 points, a total only second to the 100 they achieved last season in the history of the Premier League.
Add to that a Carabao Cup and yesterday evening's FA Cup triumph against Watford, and City have entered the record books, being the first men's team ever to claim a domestic treble in the English game.
However, with Kompany announcing his departure, and Nicolas Otamendi seemingly also on his way out of the Manchester side, we look at who could be signed to join the the remaining City defenders of Aymeric Laporte and John Stones.
Matthijs de Ligt (Ajax)
The Ajax centre back is held in incredibly high regard by Pep Guardiola, and at the age of just 19 is already showing many of the characteristics of Kompany. He led Ajax to a Dutch domestic double, with De Ligt also scoring big goals in both the Quarter-Final and Semi-Final of the incredible Champions League run. He has the physicality, leadership and ability to show up in the big games, as well as incredible maturity for someone still in his teens, the issue with the Dutchman is the high levels of interest from the likes of Barcelona, Juventus and PSG, with de Ligt rumoured to be on the verge of signing for the Spanish Champions.
Harry Maguire (Leicester City)
Maguire has been on the radar of all the big English clubs since his incredible performances at the World Cup in Russia last summer. The 26 year old scored in the 2-0 victory over Sweden in the Quarter-Finals and became a fan favourite with his incredible displays alongside City defender John Stones at the heart of defence for Gareth Southgate's team. He, like Kompany and De Ligt, is incredibly physical, and his Premier League experience may be deemed an added bonus, there will be concerns about his lack of pace and his price tag however, with Leicester wanting to keep hold of Maguire.
Milan Skriniar (Inter)
The Slovakian central defender has just signed a new contract with Inter making this deal seem a tad unlikely, however, if City offer the right amount of money, there is no doubt that Inter will look to cash in on one of their best players. Skriniar has had a superb season in Serie A this year, with his pass percentage over 92%, a trait Guardiola particularly likes with his central defenders. Skriniar is an all round defender who is maturing into one of Europe's best defenders, however, the fact he has just signed a new contract with Inter and the likely place in the Champions League for Skriniar make this deal seem unlikely.
Nathan Aké (Bournemouth)
Aké last season was one of the standout defenders in the Premier League, however, he has failed to quite reach those heights again, and although Guardiola is renowed for improving players and raising their game, Aké is not thought to be high up on the list of players Guardiola is serious about signing. At 24, he does represent a player with experience in the Premier League, as well as someone who is yet to reach their prime, in many ways he is like a young John Stones, a player who Guardiola has turned into one of the best in England.
Of course, other options for City are to keep hold of Otamendi and offer him more game time, an assurance which is expected would keep the Argentine at the Etihad. They also have young Eric Garcia waiting for his chance, with the 18 year old Spaniard signed from Barcelona 2 years ago and starting competitively in the League Cup win over Leicester in December 2018.