"I am really pleased with my team and we are playing well, scoring goals and keeping clean sheets," said the Spaniard.
"It's good for our supporters to see us top of the league but we now have to keep it going and keep working hard in every game we play. It's too early to talk about being top of the league.
"In the first half Derby were well organised and played very deep but we managed to keep attacking them and got our reward with the goals. We have so many options now in attack and it's good for me as a manager.
"We scored six good goals and it's good to see Torres and Voronin scoring goals. Kuyt worked so hard and was unlucky not to score and I really liked Babel's goal."