Blackburn manager Sam Allardyce has told his players the home match against West Ham is one they cannot afford to lose.
Defeats in their opening two Barclays Premier League matches against Manchester City and Sunderland have already put pressure on the squad.
Allardyce cannot contemplate a third successive reverse and that means tightening up at the back.
"We must get a clean sheet against West Ham to give us the basis to build our first league victory on," he said.
"The pressure starts mounting from the moment you start losing matches, whether it is the beginning, middle or end of the season.
"When you lose two on the trot the pressure builds and you can't let it get to three. We have to do our very best to win the game and if we can't we have to make sure we don't lose it."