Atletico Madrid coach Gregorio Manzano has urged people not to get carried away with their start to the season.
Atletico will be buoyed by Thursday night's 2-0 Europa League victory over Celtic, but Manzano has called for maximum concentration from his players this weekend if they want to pick up their first win of the season in La Liga.
"You have to contain the euphoria," he said. "It is September 17 and we will not be shouting from the rooftops because we have not achieved anything.
"The team has not even had 10 days working together. We need time to adapt and grow. I hope we will gradually get there."
He continued: "I was glad that the euphoria has moved to our people, but I hope it is not over the top.
"Do not think that we can beat Racing without getting off the bus.
"Any first team in the Primera Division is difficult and complicated because they have ability. We could not beat Osasuna [goalless home draw on August 28].
"We have to work hard in all aspects and dedicate ourselves 100%."