BVB Dortmund manager Thomas Tuchel was left ruing his side's second-half display after going down 2-1 at 1. FC Köln on Saturday.
BVB looked on course for three vital Bundesliga points as they led through Sokratis Papastathopoulos's 18th-minute opener, but with seven minutes remaining the visitors seemed to take their eye off the ball as a goalkeeping error allowed Simon Zoller to equalise with seven minutes remaining before Anthony Modeste struck the winner late on.
And, speaking after the result, which left Tuchel's men eight points adrift of leaders Bayern München heading into the mid-season break, the boss said: "I would have liked us to finish off the game in the first half," Tuchel said. "We should have scored a second, but we didn't manage to do so.
"Unfortunately, we completely withdrew in the second 45 minutes, almost exclusively had possession in our own half, played backwards an awful lot and were not as aggressive and courageous as we were in the first period.
"Cologne showed extreme passion towards the end of the game. You could see that we were lacking in mental and physical freshness."