Nieminen was known by both Workington and Glasgow fans as 'The Flyin Finn' because of his racing style, which produces some high speed passing.

In the 2007 season, Nieminen returned to the Workington Comets, this time as captain,[6] and also rode for Solkatterna in Sweden and TŻ Lublin in Poland.

[9] His good form in 2008 was noticed by the Elite League team Lakeside Hammers, and he was signed to the squad to cover for injuries.

[3] He joined Leicester Lions in July 2011, becoming the team captain and finishing third in the 2011 Premier League Riders' Championship.

He became national champion of Finland for the third consecutive year in September 2011, after winning the Finnish Individual Speedway Championship.