Midfielder Jack Colback is confident Sunderland can channel the frustration of their Capital One Cup exit and use it to kickstart their season, beginning with Saturday's game against Aston Villa.
The Black Cats missed out on a place in the quarter-finals of the cup competition after they were knocked out by npower Championship side Middlesbrough in a hard-fought Wear-Tees derby that ended 1-0 at the Stadium of Light.
"It was a massive opportunity for us and we've let ourselves and the fans down with the performance," Colback told safc.com.
"We've got to handle that, come out on Saturday and make sure we get the three points."
Scott McDonald's 39th-minute close-range strike was enough for Boro to progress as Sunderland lacked the cutting edge that has blighted them all season. They have drawn six of their eight Barclays Premier League games so far this season.
The loss also ends the Black Cats' dominance in the fixture as, until the game, they were undefeated against Boro in six games stretching back to January 2006.
For their part, Middlesbrough headed home with nothing to worry about.
They are riding high in the Championship and head to Charlton at the weekend looking to improve on their current position of third. Added to that, they are one of three non-Premier League teams left standing in the cup, but manager Tony Mowbray is cautious of getting too carried away.
"We're delighted to be through, cup competitions are all about getting through to next round," he said.
"But I'm a realist. We could go to Charlton and lose 3-0 and everyone will say the wheels have come off. I know there will be setbacks and when they come, the team have to remain strong, be mentally tough and keep going and believing in themselves."