The midfielder left City for Swansea this summer.
Celina said, "I was really young coming to City, there is a new academy and everything is just amazing there. From every age they have great players," he said.
“I am grateful for my time and chance there. Manuel Pellegrini was a big influence on me, he was the guy that took me up to the first team and I will always be thankful to him.
“There were so many wonderful players. I admired many of them but when I trained with the first team I looked to David Silva.
“Watching him play was incredible, just amazing. He was not the only one, but I loved the way he played. To set up a goal for someone like Aguero is something you will always remember."