Mignolet now sees his old employers back in the doldrums, with just one point from the opening five games.
"You never want to see your ex-team at the bottom of the league," said Mignolet, Sunderland's Player of the Year last season.
"I know a lot of people there and not only in the dressing room. I know a lot of people who work there, a lot of supporters and obviously they deserve better.
"I am sure they will turn it around."
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