Sunderland manager Martin O'Neill says he is disappointed at his side's elimination from the Capital One Cup at the hands of local rivals Middlesbrough.
The Black Cats were beaten 1-0 at the Stadium of Light courtesy of Scott McDonald's first-half strike.
After the match, O'Neill said: "It was an opportunity for us to get into the quarter-finals of the competition.
"We didn't play well enough, and we didn't deserve to go through."
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