Barcelona are without Lionel Messi for their Supercopa de Espana clash with Real Sociedad.
Messi scored twice in a 4-0 rout of Granada on Saturday, with the 33-year-old having now netted seven times and provided two assists in his past seven games, accumulating more goal involvements than any other LaLiga player over the same period.
The six-time Ballon d'Or winner was taken off in the 65th minute and Koeman confirmed on Tuesday that Messi had some "discomfort", but the Barca boss hoped to have his talisman fit.
It has not proven to be the case, however, with Messi – who has scored 11 league goals in total this season – failing to make Barca's 18-man squad for their semi-final with La Real in Cordoba.
Antoine Griezmann will instead play off Martin Braithwaite, who leads the line, with support from Ousmane Dembele and Pedri.
Sergi Busquets made his 600th Barca appearance on Saturday and the 32-year-old sits in midfield alongside Frenkie de Jong, with Jordi Alba, Clement Lenglet, Oscar Mingueza and Ronald Araujo making up the defence, ahead of Marc-Andre ter Stegen.
La Real on the other hand have been able to welcome back Nacho Monreal from an injury lay-off, though David Silva – who has not played since December 22 – does not feature.
The winners of Wednesday's tie will face Athletic Bilbao or LaLiga champions Real Madrid in the final.