Question: How many minutes did the current goalkeeper for Borussia Dortmund remain unbeaten at his previous club?
Sentence (from "2017–18 Borussia Dortmund season"): In addition to the domestic league, Borussia Dortmund also are participating in this season's editions of the domestic cup, the DFB-Pokal, and the first-tier continental cup, the UEFA Champions League.
Relevant evidence: No