[2] Jóhannes started his career with Valur in his native land before short spells with Metz of France and Holbek of Denmark.
After making 188 appearances for the Glasgow club, during which he scored 36 goals, Johannes won 2 Premier Division titles and 1 Scottish Cup before he moved to the US in February 1980, joining NASL side Tulsa Roughnecks.
Jóhannes started a coaching career with Þróttur in 1984[3] but soon returned to live in Scotland, where his wife is from.
Jóhannes' father Evald Mikson was an Estonian international goalkeeper in the 1930s,[2] who was later Deputy Head of the Tallinn Police during the Nazi occupation.
Atli was for a period Iceland's record cap holder, and played most of his career in Germany with Borussia Dortmund, Bayer Uerdingen and Fortuna Düsseldorf before moving into coaching.