Chris Coleman was disappointed Fulham failed to compete with Manchester United, following the 5-1 defeat at Old Trafford.
In front of a Premiership record crowd, The Cottagers were rocked by a four-goal blitz from the hosts inside the opening 20 minutes.
Though Fulham conceded just once in the second half, Coleman was still upset that his players failed to adhere to the pre-match gameplan.
“We had a gameplan, but it went out of the window after 10 minutes,” Coleman told Sky Sports News.
“We conceded in the first 10 minutes and it’s always going to be difficult against a team who keep the ball for long periods.
“Rather than just get settled in, we went hunting for the ball and they just played round us. We had a 10 minute wobble and we conceded four goals, and the game’s finished.
“It’s disappointing. We prepared very thoroughly for this game, but within 10 minutes it’s all over. Then it’s a long afternoon so it was a big disappointment.
“I think the disappointing thing for us is we were competing against Man Utd on the day and we didn’t compete.
“If we play like that on Wednesday against Bolton, which we know is going to be a ding-dong game, if we approach it in the same way, it will be another defeat.
“We’ve got to be ready for a war, a tough game, we will have to roll our sleeves up and get our heads up, and make sure we are at the races.”
United were in rampant mood in the season opener and Coleman tipped Sir Alex Ferguson’s men to reclaim the title from Chelsea on this form.
He added: “They showed there today when they hit that form, you could be looking at the new champions.
“They were devastating at times and, to be fair to our lads, we couldn’t get anywhere near them.
“We lost a bit of discipline and our shape, but when you concede so many goals in such a short space of time, your head tends to drop and we did that, that’s understandable.
“On that type of form, United are going to beat anybody. We got a lesson today. If they keep that up, I don’t see anybody to touch them in possession. Offensively they were absolutely devastating and we couldn’t live with them.”