Koeman has made clear that the arrest of former club president Bartomeu is not a good thing for the Blaugrana.
Bartomeu and three others - CEO Oscar Grau and lawyer Roman Gomez Ponti, as well as former director Jaume Masferrer - were arrested on Monday as part of the 'Barcagate' scandal, which the Dutch coach distanced himself from.
"It's not a good look for the club," Koeman said during Tuesday's pre-match press conference.
"We have to wait and see what happens. I wasn't here [at the time], I don't know what happened. We can't do anything, we have to focus on football."