Russia's Euro 2016 qualifier against Montenegro was suspended during the first minute on Friday after the visiting goalkeeper was hit by a flare.
Images circulating on social media show Igor Akinfeev being hit on the head by a pyrotechnic thrown from the crowd in the early stages of the Group G qualifier.
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The 28-year-old - who has made 78 appearances for the Russian national side - appeared to be seriously injured and was wheeled off the pitch on a stretcher as German referee Deniz Aytekin ordered the teams back to the dressing rooms.
<blockquote class="twitter-tweet" lang="en">Russian keeper Igor Akinfeev knocked out cold by a flare thrown from the crowd in Montenegro. <a rel="nofollow" target="_blank" href="https://www.awin1.com/awclick.php?mid=9&id=222025&p=https://t.co/ZMJOB7v6my" class="body-link" data-vars-item-name="BL-75371-https://t.co/ZMJOB7v6my" data-vars-event-id="c23">https://t.co/ZMJOB7v6my</a>— Football Away Days (@AwayDays_) <a rel="nofollow" target="_blank" href="https://twitter.com/AwayDays_/status/581547374750896131" class="body-link" data-vars-item-name="BL-75371-https://twitter.com/AwayDays_/status/581547374750896131" data-vars-event-id="c23">March 27, 2015</a>
The match in Podgorica remained suspended for approximately 20 minutes before play resumed, but Akinfeev was unable to continue.
The 28-year-old keeper was reportedly taken to hospital and had to be replaced by Yuri Lodygin.
Midway through the second half a scuffle ensued between players by the touchline, with Eastern Europe's Sport Klub television saying a missile hurled from the terraces appeared to hit another Russian player.
The score was 0-0 at the time and German referee Deniz Aytekin ordered the players back into the dressing room for the second time moments after Montenegro keeper Vukasin Poleksic saved a Roman Shirokov penalty.
