In-front of the onlooking Gareth Southgate, Maddison had a part in both goals as the Foxes claimed their four Premier League win of the season.
Jamie Vardy's penalty gave Claude Puel's side a first half lead after DeAndre Yedlin had handled Harry Maguire's shot following Maddison's corner.
Victory was complete 17 minutes from time when Maguire met Maddison's set-piece and headed beyond Martin Dubravka.
Reports have suggested Southgate travelled to the North East specifically to watch the former Norwich City man but the England Under-21 international is purely concentrated on his club form.
"We know Maguire is a big threat so I know if I get the delivery right he will score, he showed in the World Cup what a threat he is," he said.
"I am loving every minute in the Premier League, it's a step up but one I am relishing. I don't think about England, just worry about Leicester."
If Maddison is indeed under consideration for England selection he could be included in the squad for October's Nations League games against Spain and Croatia, which Southgate is due to reveal on Thursday.
Maguire is expected to be among the squad and he believes teammate Maddison is closing in on joining him in the set-up.
"We came here with a game plan and we were comfortable after we got the first goal, we limited them to shots from distance. James Maddison takes all the set plays now so we look dangerous," the ex-Hull City centre-back added.
"He's definitely good enough to play for England, it's a matter of time. If he keeps improving he'll get the call and he will take the challenge on."