Atletico thrashed Levante 5-0, with Gameiro scoring a brace and Griezmann getting two himself after an earlier own goal.
That impressive victory comes on the back of a series of wins that has righted Atletico’s season, and Simeone is delighted with his men.
“We have been growing,” he told reporters after the impressive Levante outing, which saw Atleti win at Ciutat de Valencia for the first time since 2007.
“In the last three or four games we have seen improvements in our intensity, pressure and chances.
“The strikers were at their best, especially Griezmann and Gameiro, but [Angel] Correa’s work was very good as was [Fernando] Torres’.
“The team is calm and our spirit is being renewed, we don’t know why, but it excites us and gives us the positive energy to keep improving.
“The group keeps working, keeps improving. They don’t want to stagnate, they keep on pushing. I like that and I’m excited.”