Germany drew 1-1 away to Netherlands in Jurgen Klopp's first match in charge.
Germany then lost 1-0 to Greece, with Dimitris Kourbelis scoring in the 74th minute.
Germany are winless in four matches since their final World Cup group-stage game.
Kai Havertz withdrew from the squad after an injury in Germany's Nations League opener.

Germany predicted formation: 4-2-3-1

Germany predicted XI: Atubolu; Baku, Anton, Thiaw, Raum; Janelt, Pavlovic; Adeyemi, Bischof, Wirtz; Burkardt

Serbia predicted formation: 4-2-3-1

Serbia predicted XI: V. Milinkovic-Savic; Terzic, Pavlovic, Babic, Nadeljkovic; Lukic, Gudelj; S. Milinkovic-Savic, Stankovic, Zivkovic; Joveljic

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