With this club he reached the final of the German Amateur Football Championship in 1955, which the Bad Homburg team lost 5-0 to Sportfreunde Siegen.
He built a successful team there with players from Eintracht Frankfurt's second tier, which became Regionalliga Süd champions in 1973.
Klug led the "Club" to the 1982 DFB Cup final against FC Bayern Munich, which was lost 4-2 after an initial 2-0 lead, however.
He then accepted an engagement in Switzerland with first-division club FC Wettingen, which he coached from March 1988 to 1 October 1990, leading it from League B to League A and the second round of the UEFA Cup, where it narrowly failed to beat SSC Napoli before being dismissed - with his team in last place.
His involvement with Dynamo Dresden in the 1993/94 season was curious, as he asked for his managerial contract to be terminated after just six months.
He last worked for MSV Duisburg as a player observer until 1998 and died after a long serious illness on 3 October 2000.