Rated as a category 4 stadium by UEFA, the Luzhniki Stadium is the largest in Russia and at the 2018 World Cup; it usually has a maximum capacity of 81,006, but was reduced to 78,011 for the World Cup. This also makes the stadium the largest in Eastern Europe, and the eighth-largest overall in Europe. To prepare for the World Cup, the stadium was closed for extensive renovations in August 2013. The spectator stands were moved closer to the pitch, which was converted from artificial turf to natural grass, after the removal of the athletic track. The historic facade of the stadium was preserved due to its architectural value, while the roof was upgraded using a new polycarbonate skin with exterior lighting. The Luzhniki did not host any matches at the 2017 FIFA Confederations Cup due to the ongoing project. The renovation project cost €341 million, and the stadium officially reopened with an international یوْلداش‌لیق اوْیونو between Russia and آرژانتین میلّی فوتبال تیمی on 11 November 2017.