The Spanish side won thanks to a last minute goal from Forlan.
Forlan told Marca: “We are very happy because we overcame a very difficult opponent, and are still in the running for two titles.”
“We showed that we are a great team. I was tired after a lot of games.
“Obviously I would love to play from the start, but it is the coach’s choice. He is conscious of the rest of the season.
“We have important games ahead, but we cannot neglect La Liga.”
Atletico will face Sporting Lisbon in the next round of the Europa League.