FC Twente
After retiring as a player, Kohn became manager at FC Twente in July 1972 and clinched runner-up spot in the 1973-74 season, in the 1972-73 season FC Twente finished 3rd in the Dutch competition, in the 1974-75, 1975-76 and 1977-78 seasons, FC Twente finished as 4th club in the Dutch competition. In May 1975 they reached the UEFA Cup Final, losing 1–5 on aggregate to German side Borussia Mönchengladbach. The Dutch Cup was won in the 1976-77 season (FC Twente-PEC Zwolle 3-0), in the 1978-79 season the Cup final was lost (Ajax-FC Twente 1-1, 3-0).