London - Arsenal were punished for a lack of discipline and
concentration in Tuesday's loss to Olympiakos Piraeus in the Champions League
and must regroup ahead of the weekend's game against Premier League leaders
Manchester United, said defender Per Mertesacker.
Arsenal's hopes of advancing from the Champions League group
stage for a 16th straight season are dangling by a thread after their 3-2
defeat to the Greek side.
The Gunners have now lost their opening two group matches
for the first time following a 2-1 defeat at Dinamo Zagreb two weeks ago and
are bottom of Group F, six points behind leaders Bayern Munich, who they have
to play twice.
Arsenal were shaky at the back and goalkeeper David Ospina's
awful mistake gifted Olympiakos a 2-1 lead five minutes before the break when
he failed to collect an inswinging corner and allowed the ball to drop over the
Also read: Mertesacker on standby for Gunners Euro qualifier
Alexis Sanchez equalised in the second half but the Gunners
seemed to switch off after the goal and Alfred Finnbogason put the Greek
champions back in front less than a minute later.
"We lacked discipline. Even when you get a goal back
don't rush yourself. We need to get behind the ball and play better
defensively," Mertesacker told the club's website (www.arsenal.com).
"Get your discipline back and with possession you get
your chances. If we are not disciplined and do not chase the ball we have got
"We lacked that concentration and it is not
understandable why we drifted and did not do the job we are used to doing. That
is not acceptable and we will be punished in the Champions League."
The German international said Arsenal had to regroup in time
to host the Premier League leaders on Sunday.
"It will take a couple of days to recover and to think
about Manchester United and play in a different competition, which will be a good
opportunity to come back to the Emirates and play our football with possession
and dynamism," he said.
Olympiakos, whose 12 previous visits to England since 1965
had all ended in defeat, scored as many goals in the match as they had managed
in the last 50 years on English soil.
"It is not an easy task to come here and get three
points," Iceland international Finnbogason said.
"We have had a very, very bad (away) record in Europe
up until now and we are very delighted to be rewriting the history of Olympiakos
by winning their first game in England," he added.For
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