The return of Shinji Kagawa from Manchester United last Sunday meant the Bundesliga giants had to make a decision on who to leave out of their European party.
Ji, who arrived at Signal Iduna Park in the close-season, has yet to make an appearance for Dortmund, having been sidelined with a thigh injury sustained in training last month.
"We had to make a decision," Klopp is quoted as saying by Bild.
"It's not like I thought 'yippee'. The decision with Ji was really tough for me. In the winter there will be a new decision [to make]."
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