The 20-year-old signed from the club’s sister team Girona in the summer, having impressed in the Spanish La Liga.
Now he is a part of Pep Guardiola’s senior squad for preseason as he looks to get regular game time when the Premier League begins.
“I’m really happy and honoured,” he told reporters.
“I am really looking forward to training.
“I thank God for the opportunity to have brought me here and I am grateful to everyone at Manchester City for signing me and putting their faith in me and I am now a part of this huge club.
“I am really looking forward to this opportunity and can’t wait to start training and make my debut for this team.
“I’m really happy to be here. It’s a new chapter in my life and I am ready for all the challenges in front of me.”