Barcelona managed to beat Manchester United 2-0, after goals by Samuel Eto’o and Lionel Messi.
“Barcelona are a brilliant team and in my opinion Andres Iniesta is the best player in the world, he’s incredible,” said Rooney.
“They’re a great team, pass the ball well and if you don’t take your chances, they will punish you. That is what happened.
“We’re still a young team and we can come back I hope.
“It is very disappointing and the feeling at the moment is not a good one. We are hurting. But we have to forget it and look forward to next season.”
He added: “It is a big disappointment, but Barcelona were the better team.
“They deserved to win. I’ve never played against a better team than this Barcelona. They’re a brilliant team.
“Barcelona scored two good goals and unfortunately for us, they came at good times. That made it very difficult for us.”