How many minutes did the current goalkeeper for Borussia Dortmund remain unbeaten at his previous club?
2012–13 Grasshopper Club Zürich season:  He remained unbeaten for 659 minutes. Roman Bürki: Roman Bürki (born 14 November 1990) is a Swiss professional footballer who currently plays as a goalkeeper for Borussia Dortmund. Roman Bürki:  Before that Bürki was part of the winning squad of Grasshopper Club Zürich that beat FC Basel 4-3 on a penalty shootout in the Swiss Cup 2013 final.
i don't know