|Date of birth||8 June 1911|
|Place of birth||Wilmersdorf, Germany|
|Date of death||27 July 1973(aged 62)|
|1932–1943||Berliner SV 92|
|1945–1952||FC St. Pauli|
|1952||FC St. Pauli|
* Senior club appearances and goals counted for the domestic league only.
Appel was born in Wilmersdorf, Berlin. He played as a defender for Hertha BSC, Berliner SV 92, Dresdner SC and FC St. Pauli. He also represented the German national team, and was capped five times between 1933 and 1938.
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