STUTTGART, GERMANY - MARCH 11: Arthur Boka (L) is challenged by Antonio Ruediger during a VfB Stuttgart training session at the club's training ground on March 11, 2014 in Stuttgart, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)
STUTTGART, GERMANY - MARCH 11: Arthur Boka (L) is challenged by Antonio Ruediger during a VfB Stuttgart training session at the club's training ground on March 11, 2014 in Stuttgart, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)