Rice featured in defeat to preseason opponents Newcastle United on Saturday.
“You need to improve," he said. “I don't think you can be happy and content with how I played last season. I'm certainly not. I know I can get better for sure.
“There is so much of my game I need to get better at, maybe going forward a bit more; sometimes in my position, I'm just there to sit there and keep things ticking; my tactical side of the game; when to drop in as a centre-half and when to push up – there are so many things.
“I'm still only 20 years old. I'm enjoying playing every week, I'm learning and I'm trying to get better."
He added: "The conditions were hard to play in, especially on Saturday when we played at five o'clock and it was really hot and sticky. Against Man City it was a bit easier as it was cooler but, like I said, we knew what were getting into when the manager decided to come here.
“It's a great tournament and it's tough, but we're going to get fitter and it stands us in good stead for when we go back."