The Black Cats are 15th - three points above the drop zone - with Champions League-chasing Everton at the Stadium of Light tomorrow.
"We know we are still in a difficult situation and people must not expect us to win 3-0 every game - 1-0 is enough.
"I was worried as I don't know the players and how they will react. - a win like that can be a poison.
"But when we started training again I could see they players were focused so I was very happy."