The 21-year-old has been in and out of the side in recent weeks and was an unused substitute for Saturday's 1-1 draw with Bournemouth.
However, Puel believes this is a natural part of his development, and the Frenchman insists Gray will be an important player for the Foxes in the future.
"He is a young player who continues to work well," said Puel.
"He continues to learn how to be consistent, and he needs to continue to work to become more clinical. It is just what you ask of all offensive players.
"He has all the qualities and attributes to play in any position, winger left, winger right and behind the striker. He is like a striker because he has good attributes. He needs to learn step by step to have a good clinical edge in the box, to have a good final touch.
"We have time with him. He is a young player and we need to be patient with him.
"He tries to continue to improve. All the players want game time. It is always difficult for a manager to try to manage all these players with a good spirit in the training session.
"If they can continue to improve it is a good thing for them and for the club, but they need to understand the work is the most important thing in the training sessions and in the games."