Victory at Old Trafford against Manchester United will secure Leicester's fate and a first top-flight title in their 132-year history.
Schlupp was on trial at United during 2012-13, Sir Alex Ferguson's final season, before he returned to Leicester and broke into the team.
"To me, it was an opportunity, I went there, saw how it worked and came back here a better player,” Schlupp said.
"I don't think I could ever turn down a move to Manchester United but I didn't get the opportunity at the time. However, it has moulded me into the player I am. Leicester City is my club, has always been my club and I'm grateful to be here.
With just two winners trophies to Leicester’s name, the 1971 Charity Shield and 1969 Division Two title, there is a huge difference between the Foxes and England’s most decorated club, Manchester United.
However, Schlupp enjoys the smaller family environment at the King Power Stadium.
"Since I've been here we've had the same laundry woman as when I was 12 (years-old),” Schlupp said.
“Same kit-man, chefs and it's great to see that we've all gone through the transition stage together as a club. They've been loyal to the staff and we've all gone through this journey together."
Boss Claudio Ranieri, who has never won a top-flight title, replaced Nigel Pearson last summer and was favourite to be the first manager sacked this season but has lost just three league games.
Wideman Schlupp revealed the squad had no idea who their new boss would be while they were pre-season training in Austria and admitted to being star struck when Ranieri first met them.
"He was always a big name, even growing up in Germany, I knew who Claudio Ranieri was and I knew he'd managed big club,” Schlupp said.
"When he walked into the room, in Austria, we didn't know ourselves actually (who it was going to be).We were all gathered and then he walked through.
"It was 'yeah wow it's Ranieri'. He's a big name and it was just excitement I think. He's proved himself."