By Andrew Gastelum The Borussia Dortmund star left Friday’s win over Stuttgart in the second minute with what appeared to be a hamstring injury. View the original article to see embedded media. Gio Reyna has been ruled out for the remainder of the season due to injury, Borussia Dortmund confirmed Sunday. The American international reportedly sustained a muscle and tendon injury that saw him leave Dortmund’s 2–0 win over Stuttgart on Friday in the second minute. The injury occurred just after Reyna made his first touch on the ball as the winger left the field holding his hamstring. He later wal…