Croatia players receive treatment before extra time (Reuters)

Croatia's midfielder Luka Modric (L) and Portugal's forward Nani vie for the ball during the round of sixteen football match Croatia against Portugal of the Euro 2016 football tournament, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Croatia's defender Vedran Corluka (3rd R) jumps for the ball with Portugal's defender Fonte (top) beside Portugal's midfielder William Carvalho (4th R) and Portugal's forward Cristiano Ronaldo (R) during the Euro 2016 round of sixteen football match Croatia vs Portugal, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Croatia's Marcelo Brozovic, foreground, and Portugal's Nani vie for the ball during the Euro 2016 round of 16 soccer match between Croatia and Portugal at the Bollaert stadium in Lens, France, Saturday, June 25, 2016 (AP)

Croatia's defender Vedran Corluka, Croatia's midfielder Ivan Perisic, Portugal's defender Fonte Croatia's forward Nikola Kalinic and Portugal's defender Pepe jump for the ball during the round of sixteen football match Croatia against Portugal of the Euro 2016 football tournament, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Croatia's midfielder Luka Modric (L) vies with Portugal's forward Ricardo Quaresma during the Euro 2016 round of sixteen football match Croatia vs Portugal, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Croatia's players strech before the extra time during the round of sixteen football match Croatia against Portugal of the Euro 2016 football tournament, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Croatia's Marcelo Brozovic, center left, jumps for the ball with Portugal's Adrien Silva during the Euro 2016 round of 16 soccer match between Croatia and Portugal at the Bollaert stadium in Lens, France, Saturday, June 25, 2016 (AP)

Portugal's forward Ricardo Quaresma celebrates after scoring during the round of sixteen football match Croatia against Portugal of the Euro 2016 football tournament, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Portugal's forward Ricardo Quaresma (R) celebrates a goal with Portugal's forward Nani (L) during the extra-time in the Euro 2016 round of sixteen football match Croatia vs Portugal, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)

Portugal's forward Ricardo Quaresma (C) celebrates after scoring a goal during the extra-time in the Euro 2016 round of sixteen football match Croatia vs Portugal, on June 25, 2016 at the Bollaert-Delelis stadium in Lens (AFP)