He represented Germany 6 times, including a UEFA Euro 1976 qualifier against Bulgaria and 5 friendlies.
In the 1979 DFB-Pokal Final, played on 23 June in Hanover against Hertha BSC, Seel scored the winning goal in Fortuna's 1–0 victory in the 116th minute.
Seel's goal earned Fortuna their first-ever Cup and made him a hero in Düsseldorf.
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