The Atletico Madrid boss was delighted with his side's persistent pressing as it beat Barcelona 1-0 on Wednesday to seal a place in the Champions League semifinals
Koke's early strike was enough to send the Catalans crashing out of Europe via a 2-1 aggregate score. That strike could also have a telling impact in La Liga, with the two sides battling it out for the league title.
Simeone was delighted with the consistent effort shown by his players - particularly forward Adrian Lopez, who replaced the injured Diego Costa - claiming they did not allow Barca's midfield stars Xavi or Andres Iniesta time to think when in possession.
"We are so happy to beat a wonderful team. We now have time to recover and think about Sunday's match," he told Canal Plus.
"We played an "area match", letting Barcelona control the ball in midfield but pressing them hard. We worked hard when we lost the ball, pressing Xavi or Iniesta and not letting them think. The first 20 minutes were excellent, then Barcelona grew into it.
"My players were so happy, we beat a great team. Adrian played an impressive match. pressing and helping in every moment. I am happy to have him back."