Wojciech Szczesny could face disciplinary action from UEFA after appearing to make an offensive gesture following his sending off in Arsenal's 2-0 Champions League defeat to Bayern Munich.
Gunners goalkeeper Szczesny was shown a red card after bringing down Arjen Robben in the box to give away a penalty shortly before half-time in the first-leg of the last-16 tie.
However, as he left the field, the 23-year-old Poland international was caught on camera making a hand gesture before heading into the tunnel.
Broadcasters Sky Sports apologised to their viewers for showing the "untoward gesture."
Despite the defeat, Per Mertesacker insisted Arsenal can still qualify for the quarter-finals -- pointing to their 2-0 win at the Allianz Arena last year.
"It's a blow but when you look back at last year -- we lost here 3-1 -- it was a bit worse than now," Mertesacker told Sky Sports.
"We're looking forward to Munich and why can we not repeat that from last year?"
The Germany international centre-back also admitted he and his teammates are in need of a break after a tough run of fixtures.
"We've played four tough games in the last two weeks,” he continued. “Munich are a fantastic team, they play with possession very well.
"We tried everything today, especially in the first 10 minutes but overall we have to take the defeat with us to Munich. Mentally we are stronger than last year."