In July 2008, Sialmas signed a two-year deal with Ethnikos which lasted for only one.
Piraeus | Ethnikos | Ethnikos Piraeus F.C. | Ethnikos Piraeus | Ethnikos G.S. Athens | Ethnikos Achna FC | Piraeus-Perama light railway | Piraeus, Athens and Peloponnese Railways | Athens-Piraeus Electric Railways |
Starting in the 1987–1988 season and until 2001 he successfully coached many teams, including Ethnikos Piraeus, Paniliakos (twice), Panionios FC, Iraklis and finally Panathinaikos.