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. Bundesliga and was on the verge of becoming 40 years of age when he enjoyed one more year in the best German division with VfL Bochum. At the age of forty Kleff played the majority of games for promoted FSV Salmrohr in the 1986–87 2. Bundesliga. The season ended in swift relegation for Salmrohr and in Kleff's decision to hang up his gloves. However, for some time he continued to be a goalkeeper for amateurs such as SV Straelen.
At the end of his illustrious career, Kleff had taken part in 433 matches in the Bundesliga and 56 games in the 2. Bundesliga.[2]
International career
Kleff's international career with the West Germany national team was limited due to his competitor Sepp Maier occupying the role of West Germany's leading goalkeeper in that decade. Kleff won six caps for his country in between 1971 and 1974, the first of which took place in Oslo on 22 June 1971, a 7–1 defeat of Norway in a post-season friendly.[3] Kleff won the 1972 UEFA European Championship trophy in Brussels and the 1974 FIFA World Cup.
Post-playing life
Kleff's resemblance to German actor and comedian Otto Waalkes earned him the nickname "Otto"[4] and minor roles in films such as Otto – Der Film (Otto – The Movie) in 1985 and Werner – Beinhart! in 1990.[5]