Southampton supporters are planning on turning St Mary’s orange when they face Tottenham on Saturday to shun former manager Mauricio Pochettino. Fans are campaigning to show support for their Dutch manager Ronald Koeman, his brother and assistant head coach Erwin Koeman and fitness coach Jan Kluitenberg. They are encouraging match-goers to wear orange instead of the usual red and white club colours to display their discontent at Pochettino leaving last year. Southampton fans have not forgiven Mauricio Pochettino for leaving Saints for Spurs . Pochettino and Ronald Koeman embrace on Southampton's visit to White Hart Lane in October . Morgan Schneiderlin takes the ball past Stoke's Steven N'Zonzi in Southampton's last game - a 2-1 defeat . The Argentine is returning to St Mary’s for the first time since he signed a five-year deal at Spurs last May. After he left, a swathe of key players followed and the place was shrouded in uncertainty about the season ahead. But Koeman made some shrewd signings to replace those departed and has guided the team to challenge for a place in Europe. Christian Eriksen in congratulated by Tottenham team-mates after scoring in last week's win over Newcastle . Southampton fans are planning to show their support for Koeman's achievements by wearing orange . The outcome of the meeting with Pochettino could prove crucial in both clubs' pursuit of European football. That is why fans are preparing the 'Ronald Koeman Day' to place extra pressure on Pochettino and his team. The idea is thought to have come from the owner of clothing range Raw Spirit, Liam Edgar, who has designed orange t-shirts with Koeman’s quote ‘the key is to believe in ourselves’ emblazoned on the front. Local pubs, bars and restaurants have got behind the campaign.
Mauricio Pochettino takes Tottenham to his former club Southampton .
Saints fans encouraged to wear orange for 'Ronald Koeman Day'
Clothing company has printed T-shirts with the Dutchman's quote: 'The key is to believe in ourselves'