Poyet concedes Colback was key to their survival battle last season.
"He helped me a lot and I will remember that and I wish him well," said the Sunderland head coach.
"Tomorrow (Sunday), I hope he has a stinker. But his character shows that he could have a special game.
"My first few games here when I started playing him in the middle of midfield - they'd been playing him left-back - he got man-of-the-match and was stood there with a big bottle of champagne - he was enjoying it.
"Of course, I would be happier for him now if he was somewhere else. It was a massive decision he took."