Boss Ronald Koeman admits Southampton must rebuild their waning confidence as they try to cling on to their European dream.
The Saints have won just once in their last five Premier League games and have failed to score in their last three outings after Saturday's 1-0 defeat at West Brom.
They remain fifth in the table, but Liverpool will go above them on Sunday if they beat Manchester City.
Southampton host Crystal Palace on Tuesday and Koeman insists they have to improve.
"The whole team's form...
West Brom took a giant leap towards safety after Saido Berahino condemned stuttering Southampton to a 1-0 defeat.
The striker scored his 17th goal of the season with a brilliant half-volley after just 70 seconds to settle the game.
The Saints dominated possession but rarely threatened the Albion goal as the Baggies kept their seventh clean sheet in 10 games under head coach Tony Pulis.
The closest Southampton came to an equaliser was when Chris Brunt deflected Ryan Bertrand's second-half cross just...