Russian organizers are hurrying to lay a new field at the St. Petersburg stadium which will host the final of the Confederations Cup.
World football's governing body has said the British firm will work at events including the Under-20 World Cup in South Korea.
Kerem Demirbay says he was not aware he pledged allegiance to Turkey before opting to accept Germany's Confederations Cup invitation.
Germany head coach Joachim Low sets his sights on Confederations and World Cup success.
Germany have announced their squads for the 2017 Confederations Cup in Russia and Under-21 European Championship in Poland.
Large chunks of the newly installed grass at the Krestovsky Stadium have been torn up in the two games played there so far.