Sir Alex Ferguson says his Manchester United side will be more aggressive in the second leg of their Champions League semi-final with Barcelona.
Cristiano Ronaldo's missed penalty was United's best chance in the first leg, which ended 0-0, but Ferguson promised a more attacking display in the return.
"Absolutely, no question about it. The game now starts at Old Trafford - it's the decider," he said.
"At home, with the atmosphere, we'll be quite different to the first game."
Barca had the majority of the possession and chances in the first leg, but Ferguson said he was happy with the way his side had come through such a tough test.
"We sealed off the areas where teams don't normally do well against Barcelona," he said.
"They had a lot of play around the box but our concentration was very good.
"On the negative side we should have done better with possession. We had opportunities to counter-attack but gave the ball away too easily.
"They didn't make a lot of chances. Going to Old Trafford at 0-0 we have a marvellous chance."
Ronaldo had a chance to get the game off to a perfect start for United when they won an early penalty after Gabriel Milito handled the ball, but he put his shot high and wide.
But the Portuguese striker appeared unflustered by his failure.
"I've scored a few penalties in that side but today I didn't score - no problem," he said.
If you get one penalty in the Nou Camp you are doing well
Sir Alex Ferguson
"Now I'm going to score in Manchester."
Ronaldo had an appeal for a second penalty turned away when he went to ground under a challenge from Rafael Marquez.
He said: "I think he touched me. But the referee didn't give a penalty. I don't know why, I don't understand."
Ferguson added: "If you get one penalty in the Nou Camp you are doing well, to ask for two I'm not surprised it wasn't given."
Barca coach Frank Rijkaard felt the penalty miss was a turning point - even though it came so early in the game.
"It was a bit of a wake-up call and after that we played well," said the Dutchman.
Rijkaard has come under increasing pressure this season as his side have fallen off the pace in La Liga and toiled in the Champions League.
But a lively performance against United was well received by the home crowd.
"In pure football terms it was not our best performance, but the team transmitted something special to the crowd and it was a great atmosphere," said Rijkaard.
"It was a very tactical game, Manchester played well on the counter-attack but we did not give them any chances and they know we are capable of scoring at Old Trafford.
"It will not be easy, we are up against a very good team but if we concentrate and remain positive, we know we can do it.
"A goalless draw is not the best result and we have to score over there, but it is not going to be easy for them. We will have our chances."
Ferguson praised midfielder Paul Scholes's contribution on his 100th appearance in the Champions League.
"His reading of the play outside the box was terrific," said Ferguson. "His interceptions were marvellous and he never gave the ball away."
Free Football Tips