 He was also part of the Mönchengladbach team which won the 1979 UEFA Cup.After a season at Hertha BSC, he returned to Mönchengladbach, Kleff played two more years in the Bundesliga for his old club, joining local rival Fortuna Düsseldorf for two years in 1982.After a fall-out with Düsseldorf he joined Rot-Weiß Oberhausen of the 2.