Borussia Dortmund prepared for their Champions League clash with Arsenal with a training session at London's Regent's Park.
The German giants surprised locals who were hoping for a kickabout on one of several bobbly pitches more accustomed to Sunday league football.
Dortmund posted pictures of them warming up and practising on their official Twitter account.
Dortmund have already qualified for the last 16 of the tournament and can secure top spot in Group G with victory over the Gunners, who trail Jurgen Klopp's side by five points in second.
