Santiago Vergini has told the Chronicle that Dick Advocaat has given the Sunderland squad more confidence.
Advocaat was appointed to replace Gus Poyet last month and the Dutchman has made a positive start at the Stadium of Light.
Sunderland's performances have improved under Advocaat and Vergini feels that this is because he has raised the confidence levels of the players.
“Whenever there is a change of coach anywhere every player’s confidence is given a bit of a boost," he said. “It may well have appeared there has been a change of attitude in the last two matches.”
The mood around the Stadium of Light was understandably down when Poyet was in charge as the team were in such poor form.
Sunderland picked up just four wins from the 29 league matches that Poyet was at the helm for this term, and they appeared to be regressing under his stewardship.
Since Advocaat has taken charge things have improved, though, and the side's displays against West Ham United and Newcastle United have been encouraging.
It means that they head into their fixture this weekend against Crystal Palace with renewed optimism and if they are able to claim the three points, then their chances of staying in the Premier League would be greatly increased.