On 6 June,
Jesse Marsch was announced as Red Bull Salzburg's new manager. In June,
Gideon Mensah signed a new contract with Red Bull Salzburg, keeping him at the club until 31 May 2024, with
Majeed Ashimeru also signing a five-year contract later in the month. On 13 August,
Diadie Samassékou left Red Bull Salzburg to join
TSG 1899 Hoffenheim, and
Maximilian Wöber joined on a five-year contract from
Sevilla. On 29 August,
Mahamadou Dembélé left Red Bull Salzburg to sign a permanent deal with
Troyes. On 30 August,
Gideon Mensah moved to
Zulte Waregem on loan for the season,
Youba Diarra signed a new contract until May 2024 and joined
St. Pauli on loan for the season. On 18 December, Red Bull Salzburg extended their contracts with
Enock Mwepu,
Sékou Koïta and
Patson Daka until the summer of 2024. On 19 December, Red Bull Salzburg and
Liverpool agreed the transfer of
Takumi Minamino to Liverpool, to be finalised on 1 January 2020. On 29 December, Red Bull Salzburg announced that
Erling Haaland had agreed to join
Borussia Dortmund, with the deal being finalised on 3 January 2020. On 6 January,
Mërgim Berisha returned early from his loan deal with
SCR Altach, whilst
Anderson Niangbo returned from his loan deal with
Wolfsberger AC on 7 January. On 9 January,
Kilian Ludewig moved to
Barnsley on loan for the rest of the season, whilst
Jasper van der Werff joined
Basel on an 18-month long loan deal and extended his contract with Red Bull Salzburg until 31 May 2023. On 15 January Anderson Niangbo, moved permanently to
Gent, and
Marin Pongračić joined
VfL Wolfsburg permanently. On 19 January,
Karim Adeyemi extended his contract with Red Bull Salzburg until the summer of 2024. On 29 January,
Youba Diarra returned to Red Bull Salzburg from his loan deal at
St. Pauli due to a knee injury. On 31 January,
Smail Prevljak left Red Bull Salzburg to join
K.A.S. Eupen on loan for the remainder of the season, and
Noah Okafor signed for Red Bull Salzburg on a contract until the summer of 2024. On 10 March, all
Bundesliga games were postponed due to the
COVID-19 pandemic. On 13 May, the
Bundesliga announced the resumption of games starting on 1 June. ==Squad==