Fabiański was included in Poland's squad for the 2006 FIFA World Cup, serving as back-up to Artur Boruc and Tomasz Kuszczak. During the qualifying campaign for the UEFA Euro 2008, he made one appearance, playing all 90 minutes in Poland's 2–2 away draw against Serbia on 21 November 2007. In September 2008, Fabiański replaced the suspended Boruc for the 2010 World Cup qualifiers against San Marino and Slovenia. He also played in another qualifying match against San Marino in April 2009.