Each team played four matches: both a home and away fixture against the two teams from the opposing country.[3] The teams didn't play against their domestic rivals. Zenit St. Petersburg played their home matches in Kyiv, as their Petrovsky Stadium was under renovation works.[4] The tiebreakers were: head-to-head results over the two legs, the aggregate goal difference. In total, 8 substitutions were allowed, but the additional five must take place at half time.[5]