Eintracht Frankfurt have signed Germany centre back Robin Koch on a permanent contract until 2027, the Bundesliga club said on Tuesday. Koch, 28, originally came to Frankfurt in summer on a season-long loan from England’s Leeds United where he was contracted until June. The 14-times capped Koch has played 23 games for Frankfurt since his arrival. Before his three years at Leeds he played at Freiburg and Kaiserslautern. “Robin’s long-term commitment to Eintracht is a strong statement. We know what we have in him,” Frankfurt board member for Sport Markus Krösche said. “He’s one of our leading pl…