Raul Garcia has warned Atletico Madrid's Champions League rivals that the team is improving with every game.

The Spanish champions made sure of qualification for the last 16 with a 4-0 win over Olympiacos, with Mario Mandzukic netting a hat-trick at the Vicente Calderon.

However, Garcia believes that Atleti's winning habit is key to their recent good form.

He is quoted by UEFA.com as saying: "The most important thing is that we keep on winning and keep on playing well.

"It is always more difficult at the start of the season but we have kept working hard and we are getting better and better with every game."

Atletico can make sure of top spot in Group A with a point against Juventus next month.