On 3 September 2010, he made his international debut with the Faroe Islands national football team in Euro 2012 qualifying match against Serbia and was substituted at half-time for Christian Mouritsen.
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On 15 November 2011, during Portugal's Euro 2012 playoff home fixture against Bosnia and Herzegovina, it was announced that Martins' three-year-old son Gustavo suffered from a rare bone marrow condition, needing an urgent transplant.
They are still undefeated in the city, with seven victories, the last against Czech Republic winning 2–1 with two Villa goals in a qualifying match for UEFA Euro 2012.
Frei gave his international debut for Switzerland on 7 October 2011 in the UEFA Euro 2012 qualifying game in the Liberty Stadium against Wales.
He refereed three matches for the UEFA Euro 2012 qualifying, and later was called as referee at the Men's football tournament at 2012 Summer Olympics.
He scored his first goal with the national squad on 6 September 2011 in the 2–0 win during the UEFA Euro 2012 qualifying game against Finland that secured Dutch qualification to the Euro 2012.