Atletico Madrid beat PSV 2-0 on Wednesday to go top of group D and Simeone has praised Kevin Gameiro for opening the scoring.
Rostov shocked Bayern Munich in an early kickoff, by winning 3-2, allowing Atletico to go top of the group and secure qualification for the last 16.
Gameiro broke the deadlock with a clinical finish just after the break and then Antoine Griezmann wrapped things up with 24 minutes to go, but it was the former Sevilla man who drew most of Simeone’s attention.
He told reporters: “Perhaps in the second half when we looked least comfortable and were under a bit of pressure, Gameiro’s break and pace helped us turn the game on its head.
“Gameiro was looking good in the first half too and had some chances.
“The goal was a demonstration of his qualities; speed, power, finishing. It was a great finish.
“That’s what both he and Griezmann offer. It was an important moment both for him [Gameiro] and the team. We were able to open up the game when they were making things difficult for us.
“After Saturday’s loss [to Real Madrid] we wanted to put that behind us.”