Born in Mytilene, Lesbos, Grammos began playing football as a winger for Achilleas Mytilene until he was acquired in 1966 by Panathinaikos for 600,000 drachmas, at a time when the "greens" were looking for young players to replace six of the older stars that had rebelled against coach Stjepan Bobek.

He was a mainstay for Panathinaikos for the next 10 years and was a member of the team that played at 1971 European Cup Final in Wembley Stadium.

Later in his career, he played for Olympiakos, becoming one of the few players that made the cross-over between the two "eternal enemies".

The original content was at Harris Grammos and is available under the GNU Free Documentation License.

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