The Blues prevailed on penalties in the FA Cup third-round replay against the Canaries, but Pedro and Morata both received yellow cards for diving before later being sent off for a second caution.
Willian was unfortunate to be carded for an alleged dive during extra time, but Conte has admitted that Pedro was guilty of trying to deceive the officials.
At a press conference, the 48-year-old said: "I must be honest I watched the three situations. I think Willian was very clear, it was a big mistake.
"Morata I think there is a fall, then you can decide to concede a penalty. There is a contact, not a dive. You have to accept Pedro was diving.
"In this situation the player is intelligent to understand when you make a mistake. He understood his mistake."
Both players are suspended for Chelsea's away fixture at Brighton & Hove Albion on Saturday afternoon.