The 'Foxes' signed Maddison from Norwich over the summer, and he bagged his first Premier League goal as they beat Wolves 2-0 last weekend.
"I think it's a good start for him but like all the players, he has to confirm his good start and play with consistency," Puel said.
"I think as a manager it will be great to see him at a high level and to play for his national team, but I think he has to keep a good focus, a good concentration in his games and if he has a good amount it will be fun for him and for his teammates."
Maddison will have the chance to shine further after Jamie Vardy was sent off against Wolves, meaning he will miss three games.
"We know his [Vardy's] importance in the team but I think we have to move on," Puel said.
"It will be a good opportunity for other players to show their quality like Inheancho, perhaps Okazaki if he can come back."