(190903) -- LISBON, Sept. 3, 2019 (Xinhua) -- Portugal's players warm up during Portugal's national football team training session ahead of the UEFA EURO 2020 qualifying round Group B matches against Serbia and Lithuania at Cidade do Futebol (Football City) training camp in Oeiras, outskirts of Lisbon, Portugal, Sept. 3, 2019. (Photo by Pedro Fiuza/Xinhua)