The Colombian started all six of the group stage matches after Wenger promised he would be the number one keeper in European games.
Ospina did not make any glaring mistakes but leaving regular first choice keeper Petr Cech to the bench at the Allianz Arena would be a bold decision.
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And according to the Daily Mirror, Wenger will keep his word to Ospina.
It is claimed the decision has 'surprised' senior players in the squad.
Arsenal boss Arsene Wenger
Many within the team are said to have thought Cech would be reinstated when the knockout stages resumed.
Arsenal will travel to Germany tomorrow after training in London.
Bayern lead the Bundesliga by seven points and are favourites to beat Arsenal in the two-legged tie.
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