Half-time substitute Yuya Osako scored a brace and provided an assist in a dominant second half for Cologne, who beat BATE Borisov 5-2 Thursday in their second Europa League home match of the season.
After the Belarusian visitors scored two goals in two minutes to turn a 1-0 deficit into a 2-1 lead before the break, the Japanese striker came off the bench and scored an equalizer in the 54th minute on a direct free kick from 20 yards out.
Sehrou Guirassy's set-piece conversion gave Cologne the lead in the 63rd, and Osako slid a shot into the net for the fourth goal in the 82nd to log his first brace since January.
In the final minute, Milos Jojic headed in a splendid cross from Osako at the right post to make it five.
"Finally," Osaka told reporters after the match.
"I went in there thinking 'someone has to do it.' With the first goal I just swung my leg without thinking. If I start thinking I knew I'd miss my chance. With the second goal I think it was my back heel. That was a nice one," he said.