Atletico reach the Champions League quarterfinals 2-1 on aggregate thanks to Renan Lodi's winner at Old Trafford.
Simeone said, "I'm happy. So many people work hard so we can have these moments. It was a brilliant effort from the lads, one of our best games this season.
"We started with a 5-3-2 then changed to a 5-4-1 with Griezmann on the right of midfield and Lodi growing more and more on the left. The defence were brilliant and Oblak helped us remain calm throughout. It was a real team effort.
"Lodi's doing really well. He had to wait a long time [to get in the side], but football is marvellous because when you train hard and are ready to go, there's always a chance for you."
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