Ospina, 28, replaces first choice Cech in the starting XI at the Allianz Arena.
Wenger's decision has been criticised by a number of pundits.
Arsenal line-up to face Bayern Munich revealed but fans are fuming
Wed, February 15, 2017
Click through the gallery for the best Arsenal reactions to their line-up against Bayern Munich
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Click to reveal Arsenal fans' reactions to their line-up against Bayern Munich
Arsenal goalkeeper David Ospina
And Keown is the latest to voice his disapproval.
He told BT Sport: "I'm astonished.
"Can you imagine Bayern Munich leaving out Manuel Neuer?"
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