The former Norwich City midfielder signed for the Foxes this week.
Maddison said, "I think it benefits everyone, the earlier it's done to be honest.
"Especially the manager, if you think of it from his point of view, he'd obviously prefer to get his signings in earlier rather than later.
"That gives him a full pre-season to work with them and get the squad really knitted together."
On preseason, he continued: "It's a big thing when you come to a new place... you want to get to get on with everyone and you want to get on with all of the staff.
"From the staff I have met today and a couple of the players, it's been really good and really promising.
"I will have to get myself right physically and I am looking forward to cracking on, meeting all the lads and getting playing."