The Blues claimed a 2-0 away victory over the Portuguese giants in Seville on Wednesday, thanks to goals from Mount and Ben Chilwell.
Speaking after the game, Mount was quick to remind his teammates about next week's second leg, which will also be played in Sevilla due to coronavirus travel restrictions.
"We knew it would be a tough game," Mount told BT Sport. "We kept going, we got the goal in the first half and the second secured a good win.
"It's only half the tie, there's a second leg to go.
"It's about time it [his first Champions League goal] came. I've been waiting patiently. It was a good time for it to come. A good pass by Jorginho, I had space and I hit it.
"I'm always working on it [finishing]. I don't think you can work on it enough. I think I can improve on it and score more goals.
"He [Ben Chilwell] showed great composure. I thought he'd shoot in front of goal but he took it past the keeper. He'll be buzzing with that.
"After the West Brom game we put it behind us. We looked briefly at it the next day and moved on. We came into this game with full focus, 100% commitment that we'd win.
"The job's not done. They'll fight for the next leg and we'll have to give it our all. We'll be ready."