The Frenchman told Sky Sports News: "I believe sometimes you have to give a chance to the players that were not completely up for it.
"If you do change one or two, then why not four, five or six. The response was very important. If that had not come then it would have been different.
"It was a convincing 4-0 win. We were shocked after Saturday's defeat and we responded to that with a 4-0 home win over Porto.
"I believe we were focused, disciplined and did not take all our chances. Overall, we would have taken 4-0 before the game.
"But it is only half of the week. The next important half is against Sunderland on Saturday.
"We have plenty of character. We are maturing and in progress. We are ambitious and confident and sometimes maybe overconfident."
"Like the boss said, we have to play together and fight together. We did a good job tonight."