Arsenal were held to a 0-0 draw against Manchester United on Wednesday night, though the French boss felt the Gunners had created enough chances to win the match
The north Londoners missed out on the chance to leapfrog Chelsea and return to the top of the Premier League as David Moyes' beleaguered visitors held on for a goalless draw.
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"I think overall we could have won it but it was a game of very few chances," he told BT Sport.
"Our defensive focus was extreme because we conceded so many goals on Saturday and they were focused on defending also.
"It could have gone 1-0 for either side.
"We had two or three chances in the second half from crosses where Giroud was just a bit short.
"When you go forward they can always catch you with the quality of strikers they have.
"It was important not to lose tonight."
Arsenal welcome Liverpool in the FA Cup on Saturday before hosting European champions Bayern Munich in the Champions League three days later.