I am just searching for his stats, when he played in Zurich!
http://www.playerhistory.com/player/13437/

This is his complete league record:

League record
1963-64 35 9 Bor. Mönchengladbach (Div. 2)
1964-65 32 17 Bor. Mönchengladbach (Div. 2)
1965-66 31 13 Bor. Mönchengladbach (BL)
1966-67 31 11 Bor. Mönchengladbach (BL)
1967-68 34 13 Bor. Mönchengladbach (BL)
1968-69 27 10 Bor. Mönchengladbach (BL)
1969-70 29 6 Bor. Mönchengladbach (BL)
1970-71 32 9 Bor. Mönchengladbach (BL)
1971-72 28 17 Bor. Mönchengladbach (BL)
1972-73 18 3 Bor. Mönchengladbach (BL)
1973-74 25 0 Real Madrid (Spain)
1974-75 31 7 Real Madrid (Spain)
1975-76 29 2 Real Madrid (Spain)
1976-77 26 3 Grashoppers (Switzerland)
1977-78 0 0 Grashoppers (Switzerland)