Foden led City to the Premier League title last season, winning the Football Writers' Player of the Year award in the process.
“Without a doubt Phil Foden is my favourite player,” said Aguero in a fans' Q&A.
“He is the player who, when I saw him come to the first team for the first time, I saw his quality, his talent and his liveliness at such a young age.
“I think that at 16 he has improved a little with the team and he did things as a kid that made it clear that in the Premier League he could do very well.
“One time Pep Guardiola asked me who was the player (in the Academy) at City that I believed in.
“I would like to meet him again and play because I think he has a huge future at City and I believe that today he is the most complete player that City has.”