In the 2004–2005 Master of Science-liiga season, Mikkola was the best defenceman of the league and was also chosen to the Master of Science-liiga All Star-game. Mikkola was drafted to National Hockey League by Montreal Canadiens in third round as 65th overall in 1997 National Hockey League Entry Draft.
In the time of his 12 seasons in league, Mikkola has won eight championships, which is more than any active player in the league. Of the eight championships he has won four with Kärpät, one with Jokerit and three with TPS. Including the eight championships in Master of Science-liiga, Mikkola has also won gold medal in 1998 World Junior Ice Hockey Championships. He has also won silver medal in U18 European Championships.
