Phil Bardsley feels Sunderland laid down a marker with victory over Manchester City.
The Black Cats shocked the high-flyers at the Stadium of Light last week.
"Now we've got to build on what we did against Manchester City. That was a great win but there's still a long way for us to go and we've got to show the same commitment and desire that we showed in that game for the rest of the season," said Bardsley.
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