Douglas Costa has been ruled out of Bayern Munich's Bundesliga game on Sunday against Borussia Monchengladbach with a left knee injury.
Bayern boss Carlo Ancelotti said at his Bundesliga news conference: "Costa had a minor problem with his knee. We will get him checked out tomorrow."
The Bavarians followed up by announcing on their club website the 26-year-old Brazil winger will stay in Munich for treatment. Therefore, Costa will also not travel to meet up with the Selecao for their forthcoming World Cup qualifiers against Uruguay and Paraguay.
Arturo Vidal misses Sunday's trip to mid-table Gladbach due to suspension, but Ancelotti confirmed that apart from Costa, he had a fully fit squad at his disposal.
His full-strength squad leaves him with a "tough decision as he can only choose 11 players," he said. "But I am happy that they are fit."
Ancelotti confirmed Jerome Boateng would again have to make do with a place on the bench as he continues his comeback from injury.
Boateng was not named in the Germany squad either after making his first appearance in 108 days as a substitute in the 3-0 win over Eintracht Frankfurt last week.
"I spoke to Joachim Low and told him that we feel Boateng still needs time to get back into top condition," Ancelotti said.
Gladbach were involved in Europa League action late on Thursday, while Bayern will have had eight days between their last game against Frankfurt and this weekend's Klassiker. Despite his side benefitting from extra rest, Ancelotti is expecting a tough game against the Foals.
"It's only an advantage when we play with intensity. If we play slowly, they can play for 200 minutes. If we play quickly, then it is going to be difficult for them. It all depends on our intensity."