Arsenal manager Arsene Wenger has described continued criticism of his side as "very, very, very, very boring" and threatened to walk out of a press conference when questioned about Jose Mourinho.

The Gunners were beaten 3-2 at home by Olympiacos on Tuesday night, when stand-in goalkeeper David Ospina dropped a corner over the line and the defense then conceded a third goal immediately after equalizing.

Arsenal – who next face a double-header against Group F leaders Bayern Munich – came in for heavy criticism from both media and pundits alike, with former Manchester United captain Roy Keane labeling the team as "weak", "soft" and "lacking winners".

Wenger launched an impassioned defense of both his team and his own tactics in deciding to select Ospina ahead of 2012 Champions League winner Petr Cech as he faced questions ahead of Sunday's Barclays Premier League clash against Manchester United at the Emirates Stadium.

"You come to the game, you judge the game and you assess if I am right or wrong. I never critiqued that, I accept your judgement of how the team played and your assessment, but I don't have to give you all the information I have to make my decisions," the Arsenal manager said.

"I make the decision that is right on the day and I am accountable on the results of my team and the way we play football."

When pressed to respond to the comments of Chelsea boss Mourinho that there was only one manager in the Premier League not under pressure, Wenger curtly replied: "Look, stop that story or we stop the press conference."

The Arsenal manager hit back at the sweeping criticism of his side.

He said: "I think you lack a bit of creativity in the press at the moment, that you follow a bandwagon that is very very, very, very boring. I don't go along with that.

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"If you have any interesting questions for Sunday's game I can answer, but apart from that let's not come back always to the same story.

"You have not watched well the game on Tuesday night. You come always with that same story… you can put the goalkeeper you want in the goal, he can make a mistake, you have to accept that. It's down to everybody. But if you have watched the game and you come down to the conclusion that we lost the game because of Ospina, I question your knowledge of football."

Wenger remains frustrated at what he sees as a lack of a "bit of creativity" from the media and a lack of proper match analysis.

"One pundit says something on television and all behind that they repeat exactly the same thing. It is quite boring because nobody came out with numbers of this game where the game was won and lost," the Gunners boss continued.

"It is quite depressing to read that and to hear that, to all come just to the same conclusion and not to have watched well what has gone on on the pitch.

"We have lost the game because we didn't defend well, yes the goalkeeper made a mistake, but we could still have won the game in spite of that."

Wenger is confident his players can produce the required response against United, who currently lead the table.

"We learn from victory and we learn from defeat," he said.

"There are three points between the teams, we play at home in a big game. We have just come from a big win at Leicester and we want to continue our run."

Center-back Laurent Koscielny is expected to be sidelined for around three weeks with a hamstring problem picked up against Olympiacos. Midfielders Mikel Arteta and Mathieu Flamini remain out.

This week marked the 19th anniversary of Wenger's arrival at Highbury.

However, the 64-year-old believes now is not the time for nostalgia.

"I did not realize it is such a long time because we are just focused on what is in front of us, the next game," he said.

"One day maybe I will look back, but I don't think today is that day."