**Arsenal manager Arsene Wenger warned his side against complacency after their 2-0 win at Celtic in the first leg of a Champions League qualifier.**A place in the Champions League group stage is at stake and Wenger said: "We have a good advantage but it is 180 minutes and we are in front after 90.
"You want to play well for 180 and that is our purpose.
“We have to make sure we win the game at home, we have to take it seriously and it is a massive game.”
Wenger conceded that his side’s goals came in fortuitous fashion but believes the Gunners deserved their luck in an impressive performance.
Arsenal’s first goal came when a Cesc Fabregas free-kick struck William Gallas on the back and beat the wrong-footed Celtic keeper Artur Boruc.
Celtic let in a second as defender Gary Caldwell diverted a low cross from Arsenal left-back Gael Clichy into his own net.
“It was a fierce battle,” added Wenger. "We dominated the game but Celtic were always fighting and counter-attacking and in the end, despite being in control, we scored two lucky goals. But yes, of course, we merited the good fortune.
"I concede that we were lucky with the goals but we had plenty of opportunity in the first 15 minutes of the second half.
"We needed a very strong Arsenal side to win the game.
"The crowd was up for it and the team was up for it and if it had been an average performance from Arsenal we would not have won the game.
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"The atmosphere was better than the Premier League and people were fair.
“Celtic were organised and even at 2-0 they never gave up.”
Some of Celtic’s aggressive tackling did not go down well with Wenger but he praised the way his players responded to the tough-tackling and maintained the form that resulted in them thrashing Everton 6-1 in their opening Premier League game last Saturday.
“There were some bad fouls,” stated Wenger. "The referee took some time to intervene and we had some harsh treatment.
"But I am very happy with the commitment of my team, despite the physical approach of some Celtic players.
“I could understand that from Celtic’s point of view but what made it more interesting is how we respond to that and I believe we did that well.”