There was only one way to celebrate. As they began to bask in a surprise derby victory at Borussia-Park, the plan of Cologne’s players quickly clicked into gear. The players in red scampered to the north-west corner of the ground where the away support would usually be penned in, and Salih Özcan uprooted the corner flag before popping a shirt on it and waving it in the air above his jubilant teammates.
The ribbing wasn’t lost on Borussia Mönchengladbach’s players. This has been Marcus Thuram’s victory routine since he arrived from France, normally flying his flag in front of the fans in the ground’s Südtribune. It goes on the road, too. When Gladbach and Cologne last faced each other in the first fixture at the start of October,…