He played as a defender in the 1st Bundesliga for Eintracht Braunschweig, there was used from 1968 to 1984 a total of 419 times, scoring 22 goals. He is 1.79 m tall and weighed 78 kg in his playing days. To Eintracht Braunschweig he came in 1967. Previously, he played for the MTV Dettum and the amateurs of Hamburger SV.
Overall, he had Eintracht 1968-1984 504 point game inserts (27 goals). He 's a record player of the club, both on the number of Bundesliga games and the point stakes at all.
For Eintracht Braunschweig, he played 15 times and the European Cup once ( 1969) in the U-23 national team.
1971 Merkhoffer was sentenced to pay a fine in the amount of DM 4400 because of his participation in the Bundesliga scandal.
He was one of the key players of the multiple points leader, favorites fright and UEFA Cup participant of the 1970s, also lived to a leading position in the first years of decline after 1977, but resigned in 1984 as the Bundesliga player of the former table Ninth off without even the decisive descent to have been involved in 1985. His trade is a chef. His passion for riding (and perhaps also its robust performance as a defender ) earned him the Eintracht audience the nickname "Horse -Franz ".