|Date of birth||16 January 1958|
|Place of birth||Domokos, Greece|
|Date of death||30 April 2012(aged 54)|
|Place of death||Patras, Greece|
|–1977||Achilleas Domokos F.C.|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Born in Domokos, Gravanis began playing football with local side Achilles Domokos. Gravanis joined Panionios in July 1977, and played eleven seasons for the club in the Alpha Ethniki, appearing in 269 league matches. He made his Alpha Ethniki debut on 10 January 1978, and helped Panionios win the 1978–79 Greek Cup final against AEK Athens F.C.
- Mastrogiannopoulos, Alexander (2003-04-24). "Greece 1977/78". RSSSF.
- Mastrogiannopoulos, Alexander (2003-06-19). "Greece 1987/88". RSSSF.
- "Πέθανε ο Γιάννης Γραβάνης" [Giannis Gravanis died] (in Greek). Sport.gr. 30 April 2012.
- "ΕΘΝΙΚΕΣ ΟΜΑΔΕΣ > Εθνική Ομάδα Ανδρών" (in Greek). Hellenic Football Federation. Retrieved 2009-11-30.
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