The Colombian dropped the ball over the line to gift the Greek side a 2-1 lead as they went on to win 3-2, condemning the Gunners to a second consecutive Champions League loss.
Wenger, though, defended his choice to pick Ospina and leave Cech on the bench but refused to explain his selection.
“I do not have to sit here and give you an explanation about every decision I make,” he told reporters.
“That is always the simple thing. Ospina kept 14 clean sheets in 19 games last season and was fantastic against Tottenham last week. No goalkeeper is mistake-free.
“I make the decisions and selections for the team and I am responsible. I know many things that you don’t know or you ignore. You can’t select a team by taking a poll before the game and taking everyone’s opinion.
“Honestly, I don’t want to go into the conversation about regrets with you.”
The result leaves Arsenal bottom of Group F with two games against Bayern Munich, who have won all of their matches in the Bundesliga and Champions League so far next, but Wenger says his side still have a chance.
“It leaves us in a bad position but we are still in it. We have to get a result in our next game against Bayern at home,” he added.
“Some aspects of our game were quite good but we lacked quality in our defensive concentration. I believe we had a bit of bad luck as well – they had four shots on target and scored three goals.
“The turning point was at 2-2. We got back in the game and then gave them 3-2 straight away. We feel guilty because we gave easy goals away.”
Arsenal suffered a further blow with defender Laurent Koscielny forced off due to injury with Wenger unclear how long he may be out for.
He added: “It looks to be a hamstring. We play many games. We rotate the team and other teams do as well. You can’t play every three days without rotating your players.”
A Freelance Journalist, Entrepreneur and Philanthropist. Editor-in-Chief of www.233times.com. A contributory writer for Ghanaian Chronicle Newspaper. An alumnus of Adisadel College where he read General Arts. He holds first degree in Bachelor of Arts from the University of Ghana; Political Science (major) and History (minor). He has also pursued MSc Corporate Social Responsibility (CSR) and Energy with Public Relations (PR) at the Robert Gordon University in the United Kingdom. His mentors are Rupert Murdoch, Warren Buffet, Sam Jonah, Kwaku Sakyi Addo and Piers Morganview all posts by: Nana Kwesi Coomson
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