Myllys started playing ice hockey for the local team Savonlinnan Pallokerho or SaPKo. He played his first adult season (1982–1983) in SaPko, but moved to Tampere for SM-Liiga games in Ilves. Myllys spent a total of three seasons (1983–1986) with Ilves, then moved to Rauman Lukko where he stayed for two seasons (1986–1988) before moving to the NHL.\n', '

Myllys gained a spot in the Minnesota North Stars lineup. He played 6 NHL games in the 1988–1989 season but spent most of the year with the North Stars\' farmteam, Kalamazoo Wings of the IHL. In his 3 seasons (1988–1991) with North Stars Myllys never played more than 10 games in a season. He spent most of these seasons in the IHL. When the San Jose Sharks were formed in 1991 Myllys moved to San Jose along with several North Stars players in the Dispersal Draft. Myllys played 27 games with the Sharks during the 1991–1992 season. This was his last season in the NHL, as Myllys returned to Finland in 1992.\n', '

In 1992 Myllys joined the 1 Divisioona team KooKoo, which located in Kouvola. After one season with KooKoo Myllys went to Lukko and stayed there for the 1993–1994 season. After his second season since his return in Finland, Myllys signed to Swedish Elitserien team Luleå HF.\n', '

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