Koch is expected to join Leeds in the coming days after agreeing a four-year deal with the club.
Leeds are hoping to sign Robin Koch from Freiburg if they fail to get former loanee Ben White.
Leicester City have reached an agreement to sign defender Caglar Soyuncu from Bundesliga side Freiburg.
Freiburg defender Caglar Soyuncu says he has rejected offers in Turkey to sign for Arsenal this summer.
Freiburg centre-back Caglar Soyuncu is a transfer target for Arsenal, according to the player's agent.
Caglar Soyuncu seems to rather like the idea of joining "one of the most important clubs in England".