The Gunners got a much-needed win on Wednesday. Reuters

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Arsenal started their UEFA Champions League match day two encounter with Greek side Olympiakos in sparkling form but had to see a out a nervy night at the Emirates to take their first three points of the tournament.

Arsenal, who netted 14 times in last seasons group stages, made an explosive start to the game with goals from new signings Alex Oxlade-Chamberlain and Andre Santos but David Fuster headed in for the Greek side and Mikel Arteta made a goal-line clearance as the Gunners held on for the win.

Arsenal looked anything but convincing in defence, with David Fuster powering in an unmarked header before the break.

The Gunners, who head to arch-rivals Tottenham on Sunday, were happy to sit back on their lead - but some careless defending should have cost the Gunners.

In the end, though, Arsenal did just enough to secure their second victory of the week and restored some much-needed confidence ahead of what is sure to be a testing trip to White Hart Lane.

Oxlade-Chamberlain became the youngest-ever English goalscorer in the UEFA Champions League, netting Arsenal's two-hundredth goal in the Champions League. Andre Santos made it two after the full backs surging run down the left where his cross towards Marouane Chamakh was cut out, only for the left-back to continue his run and fire beyond Franco Costanzo at his near post

Both sides had chances to win the game but Arsenal held out for a nervy Champions League victory.