Aston Villa manager Martin O'Neill revealed his disappointment after his side's 1-0 defeat to Sunderland on Saturday.
A goal from substitute Michael Chopra seven minutes from the final whistle was enough to ensure Sunderland their first win at Villa Park in over 25 years.
Villa came closest to scoring when substitute Marlon Harewood sent his strike just wide of Craig Gordon's post after 58 minutes.
The defeat for Villa dents their hopes of finishing in a European spot and O'Neill concedes the result was disappointing.
"We were disappointing and I felt that we were probably at least capable of saving the game and not losing it," O'Neill told Sky Sports.
"We had one or two chances but didn't take them. The main part of the game wasn't good enough.
"You can have very tight games, and today it was tight, and you have to be able to take a chance or two.
"A couple of weeks ago we were creating more chances, playing with more flair, but we've been disappointing in the last few games, including today."
O'Neill issued a rallying call to his side after their defeat to Portsmouth last time out and is disheartened by the performance today.
"We have to be able to perform every single game," he added. "This league can exploit every weakness you have and it erodes our confidence.
"We've been going along nicely, but that's not good enough and we need to address that.
"The crowd were fantastic today and we didn't give them enough to cheer this afternoon.
"We needed a bit more than luck, we need to be up to the mark every minute. We're not good enough, this is not a disparaging comment on our team, but at the end of it all we have to be at the tempo of the game all the time.
"Today was disappointing, it was a chance to win a game of football and we failed."