Midfielder reacts following cup reverse.
Jack Colback couldn’t hide his disappointment following the cup defeat to Middlesbrough on Wearside.
A lone goal from Scott McDonald proved enough for the visitors as Sunderland missed out on a place in the quarter-finals of the Capital One Cup.
“It was a massive opportunity for us and we’ve let ourselves and the fans down with the performance,” Colback said after the game.
“Going into the game we were looking to start well and get through but it didn’t happen on the night.
“We knew it would be tough. They have been going well and it was a derby game.
“We let Boro get into the game and get the goal and that goal hit us harder than it should have done.”
Meanwhile Colback says the squad must show their character and bounce back quickly.
The Black Cats welcome Aston Villa to Wearside this weekend and manager Martin O'Neill will be looking for a response.
“There were a few times where we didn’t play well last year and we always came out fighting in the next game,” Colback explained.
“We have to deal with the pressure as players. The fans had a right to get on our backs tonight because it wasn’t good enough.
“We’ve got to handle that, come out on Saturday and make sure we get the three points.”