"My farewell, ahead of a new challenge in my professional career". The 23 year old has agreed a five year contract and is now the second most expensive defender in the world after Liverpool's Virgil van Dijk.
Guardiola also said France defender Mangala would remain at the club.
"I had a training session yesterday, It's a great group". You can tell how we are doing.
"I arrived as a teenager and here I grew up as a person and as a footballer". To compete we needed to spend. "I even have goose bumps", he added. He's strong in the air and fast. Obviously having Pep Guardiola as manager of your team changes lots of things. He is a very prestigious manager and we must take advantage of that to learn and to improve. "I'm really excited to be in such a big club as Betis is". He is an awesome guy and we are pleased but we are looking for the best solution. If we score early goals it can help us a lot. "He's got good quality and we are delighted".
So what can we expect?
Why didn't he sign in 2016?
"My feeling is English football is not like this", he said.
But he is yet to make his worldwide debut?
The Premier League leaders have always remained interested in the services of the France U21 global.
However, City finally has their man.
City's winning run of 12 games is their joint-longest streak against a team in their league history (level with Newcastle). Stones, Laporte and Otamendi could rotate in a week to week basis. Meanwhile, club captain Vincent Kompany has had perennial problems with injury, and at this point he can not be relied upon.