Leeds were beaten 1-0 on Saturday night, thanks to Semenyo's goal just on halftime.
“Yeah I’ve definitely seen (a difference in mentality),” Semenyo said afterwards. “It starts in training every day. Little habits - passing drills, possession.
“It’s the attention to detail, everyone’s focused. It’s not lacking. When you do that in training it follows into games and everyone just wants to win.
“Everyone’s just major focused, and that shift in mentality is so crazy. Little things and making sure you’re in tip-top shape.”
Semenyo also explained his goal celebration, which was him playing an 'air guitar'.
“A few friends said I should do something funny, so it’s the first thing that came up in my head,” he added.
“Nice guitar, good performance, crowd loved it and that’s it.”
The win sees City move within two points of leaders Arsenal.
“It means everything (to close the gap). We just want to win all our games on our side and whatever Arsenal do we’ll have to wait and see.
“We have to control what we can control.”