Arena Petrol is a football stadium in Celje, Slovenia. It is the home ground of NK Celje since 2003. At the time of its opening Arena Petrol was the most modern football stadium in the country. It takes its name from its principal sponsor, the Slovenian oil company Petrol. The stadium opened on 9 September 2003 with its single stand giving it a capacity of 3,600. During the next years three additional stands were built until the stadium was completed in 2008 with the capacity of 13,059 seats; 7,000 of which are covered. The pitch in the stadium is 105 metres long and 68 metres wide and covered with natural grass. The stadium also features a pitch heating system and floodlighting.