Colback insists the situation won't affect his on-field commitment.
â€śI find it hard to believe anyone would go into a game and not give it their all, to be honest,â€ť the midfielder told the Sunderland Echo.
â€śItâ€™s certainly not in my nature, and it goes without say that giving my absolute best is something Iâ€™ll continue to be doing.
â€śAndrea Dossena coming in now to compete for the left-back position is something Iâ€™m very much aware of and I know that if I donâ€™t keep performing to the best of my ability heâ€™ll be straight in there.
â€śBut being on the bench when Iâ€™m 23 is not something I want to happen.â€ť
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