Silva's move from Sporting CP was finally rubberstamped on Monday after he was blocked from joining Leicester at the end of the summer market due to late paperwork.
Puel said: “He made a lot of training sessions without the possibility to show his quality. It was harsh for him to train without the possibility to play.
“He kept a fantastic positive attitude all the time. Now it's a good reward to come in and to look forward. It's a good thing for us. He had to make more efforts than the other players to keep a good level of fitness. Now it is good for him to come on in the game and now to look forward.
"It is a good thing for us of course because he can bring a good feeling to the team, like Matty James after his injury. It is amazing."