Neuer, 30, has kept 13 clean sheets in 25 games for Bayern this season and played in the German champions' 1-0 win over Borussia Moenchengladbach on Sunday.
Trapp has made 11 appearances at the under-21 level for Germany and kept 10 clean sheets in his last 16 games for PSG.
Germany play England in Dortmund on Wednesday before travelling to Baku to face Azerbaijan four days later.
(Reporting by Aditi Prakash in Bengaluru; editing by Richard Lough)
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