"The referee should have sent off the left-back three times at least because he destroyed Walcott," Wenger said.
"I wanted to understand how we had only three minutes of injury time, and then only played one minute," he said.
"Every referee looks to have a different computer to calculate the injury time and still I do not know and really understand how it works.
"It looks like it is through the inspiration of the referee and he could not explain it. He just said it was enough."
On the upcoming match at Bolton, Wenger added: "The game is a mixture of frustration and relief.
"We are in a good momentum and it was important to at least come back from Ukraine with a point, even if it should have been three.
"The game should be over at half-time because we had clear chances in the first half, but it is a relief because with three minutes to go we were 1-0 down.
"I felt our level dropped in the second half and we did not create as many chances as we would have liked to. We feel we have lost two points."
