The former Real Madrid manager admits he needs the striker to maintain his form this summer.
He told CNN: "I hope he [Rooney] will be the same in June, not tired, because he is in a fantastic moment.
"Sir Alex (Ferguson) decided to buy him from Everton when he was really young and he has improved every year.
"I told him, 'Rooney, if you want to score goals you have to go in front of the goal', because he works a lot, he runs a lot, he helps everyone in every moment, he is really generous."
However, the 63-year-old is adamant England are not a one-man team.
"He's one of the most important but I think you cannot win with only one important player," Capello said.
"If you want to win you have to create a group, a squad, a good system and everyone has to know what he has to do during the game in every moment."