Arsenal's Europa League clash with Cologne was delayed by 60 minutes on Thursday "in the interests of crowd safety".
Arsene Wenger's men kick off their Group H campaign at the Emirates Stadium with the visit of the Bundesliga side, who attracted a huge following of away fans.
With kick-off approaching, it was reported that congestion around the stadium was causing delays and potential issues with safety.
The Gunners then confirmed the match had been put back by an hour.
The kick-off of #AFCvCOL has been delayed by an hour in the interests of crowd safety-- Arsenal FC (@Arsenal) September 14, 2017
The development is perhaps unsurprising given approximately 20,000 supporters are reported to have arrived in London for Cologne's return to European competition, despite only 3,000 tickets being made available to the club.
Earlier in the day, a large group of travelling fans brought the centre of the capital to a standstill as they congregated down Oxford Street.
????????????-- Koki Harada / ???? (@kokidaiz) September 14, 2017
Around Emirates Stadium. pic.twitter.com/p0cz170Obk