Stoke have now lost four in succession following the 1-0 reverse at Everton. Luck appears to have deserted them with crucial decisions not going their way in the league games.
"That's four (successive) games now we have lost, this has never happened," said the 32-year-old.
"We need to look forward now and win the next game against Sunderland because we can't lose five games.
"Everybody is disappointed, it is hard for the club and hard for everybody. Everybody is upset - this has never happened before, never.
"We need to forget this game.
"We need to keep the ball and play football. We have more players now, better players this season.
"Everybody is working hard."