Atletico Madrid defender Diego Godin admits Sergio Aguero is crucial to their hopes this season.
Aguero had not played for Atletico for almost a month due to injury but he made an immediate impact as a second-half substitute against Rosenborg, scoring 60 seconds after coming on and then setting up the third goal for Diego Costa.
Godin said of the Argentina ace: "It's not a mystery. He's a very important player in the team and you notice when he's missing. Fortunately he returned and took advantage of the time he had against Rosenborg. He's a fundamental piece of this team."