Kagawa revealed to fans in a Twitter Q&A that Buttner knows some Japanese.
"Alex Büttner lives quite close to me and we joined the club at the same time; I've been pretty close to him ever since. Alex played with Japanese players at his last club [Vitesse Arnhem], so he knows and understands the language reasonably well. That allowed me to be even more comfortable with him."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball