Lampard, a Chelsea legend made the shock loan move from New York City FC to Manchester City in the 2014-15 season.
Asked on Sky Sports' Soccer AM show about who was the most fined player at Chelsea, Lampard said; “at Chelsea, I can't remember but I will jump to Manchester City.
“Aguero picked up a fair few. He just didn't care. He was so laid back and would just stroll out to the training pitch like five minutes late.
'"[The coaches would say] right you're fined" and he would say ‘OK, no problem. Wait until the weekend and I'll score a hat-trick and everyone will be happy’.'