The half-time Pep-talk did the trick, with two goals in three minutes after the re-start ending the hosts’ resistance and giving City a 3-0 win.
But the Catalan boss added he felt a bigger margin of victory would not have been merited by his team.
"The way we played we didn't deserve more than three goals,” said Pep.
“We will improve in the future. We have to demand more from ourselves in every game and do our best, but sometimes it's difficult. They defended deep and man to man
“In the second half we were better, especially the first 15. Our rhythm was not quick enough in the first, but we would take that result.
“I am honest with them and tell them all the time what I feel.
“We have to try and find the reason why we didn’t play quicker or better.
“After what these guys have done in 16, 17 months, it can't be lack of intensity or not wanting to run.
“We didn't make passes in a row, we had to move it quicker. We spoke about what we should do in the second half.
“We have to demand from ourselves to do our best every game. So far, we have been incredible. Champions League, one step from Carabao Cup final.
“We have incredible points - 56. It’s a lot of points. But every game teaches us and shows us what we have to.”
And the boss admitted he was happy his team passed a century of goals for the campaign with the win over the Terriers.
“It’s a lot of goals yeah,” he smiled. “We have done so well. In Premier League one team has been better, but it’s January and there are many games left to play. In January, you don’t win the Premier League.
“I would rather be in Liverpool’s position. All we can do is win our games. Improve, analyse our games and try to improve.
“I cannot answer about Liverpool every press conference. Now we have the Carabao Cup. We will see.”
Kevin De Bruyne playing the full 90 minutes was another positive for the Blues as Pep added: “Kevin played 90 minutes, that is good news. When you are a long time injured you need the rhythm.
“Sergio was sick, and he needs time, too. You need players, they are incredible, but they need rhythm.”