Career
In Estonia, Pareiko played for Tallinna Sadam and Levadia Maardu, before moving to Russia in 2001, when he signed with Rotor Volgograd. After Rotor were relegated, Pareiko moved to Tom Tomsk. At the end of 2009 season Pareiko was named the Tom Tomsk Player of Year, sharing this title with Đorđe Jokić.
In late 2010, speculation began to mount that Celtic were interested in Pareiko"s services.
Pareiko was left on the bench for Tomsk"s last match of the season. He left the club on 25 December.
On 8 February 2011 Pareiko joined Polish Ekstraklasa side Wisła Krakow on a one and a half year deal. Pareiko finished third in voting for the Estonian Football player of the Year in 2011.
He became the first choice keeper after the retirement of Mart Poom.
On 17 November 2015, Pareiko made his last apparence as the goalkeeper of Estonia against Saint Kitts and Nevis. The game ended 3-0 for Estonia Tallinna Sadam Casale Calcio Levadia Maardu Wisła Krakow Individual.