"You have to rest more when you play for 120 minutes rather than 90 minutes", said Cherchesov, who confirmed Yuri Zhirkov could be out for the remainder of the tournament after the left-back went off injured. A fearless defensive performance from Russian Federation in extra time earned them a penalty shootout against the 2010 winners, where Akinfeev was ultimately the hero.
"Years ago I said he could end up being the world number one", said former German goalkeeper Oliver Khan on Akinfeev's abilities as a goalkeeper and captain.
"I think Paris St Germain is very well represented (at the World Cup), but now we are talking about the Brazilian national team and I think our team is very balanced".
It was the fifth time in a row a World Cup host nation has won a penalty shootout, Federation Internationale de Football Association said.
At the height of the Cold War, Spain beat the Soviet Union 2-1 in the 1964 European Championship final, a game which took on extra symbolism as a battle between the Soviets and Spain's staunchly anti-communist dictatorship under Francisco Franco.
Having long run out of steam and with several players cramping, Russian Federation were reduced to desperately defending in extra time. The victor will play either Croatia or Denmark in Sochi on July 7.
Russian Federation will face Croatia in their quarter-final at Sochi's Fisht Stadium on Saturday.
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The video shows 6ft 4in striker Dzyuba between the sticks at training, pulling off a mirror-image stop to the one team captain Akinfeev made against Spain to win the shootout.
Despite 75 percent possession and more than 1,000 passes, Spain's famed tiki-taka game rarely carried them into the box and they had to wait until the 85th minute to test Akinfeev with a low drive from substitute Andres Iniesta. The defeat also marked the end a of glittering worldwide career for Andres Iniesta, who was brought on midway through the second half for his 131st and final Spain appearance. Russian Federation has completed the same number of passes in four World Cup matches combined, just 202 Sunday.
Russian Federation hadn't practised penalties and didn't have a dedicated penalty taker for the game.
"If you analyse every minute of the match, we had people attacking, we had attackers on the wings, in the middle", Hierro said.
Aleksandr Golovin's early break down the right raised excitement levels among Russia's loud following, but his cross was blocked and Aleksandr Samedov's resulting corner was too deep.
The rule is aimed at reducing injuries and allowing higher-quality play in extra time, when players are most exhausted.
Stanislav Cherchesov said that his tactics - and the way his players executed them - were the key to Russia's surprise last 16 victory over Spain.