Russia coach Stanislav Cherchesov believes messages of support from president Vladimir Putin provide extra motivation for him and his players.
Putin attended the team's World Cup opening win against Saudi Arabia and although he has not been present at their other matches he has been keeping in touch with Cherchesov.
"Putin has been calling me. He called me before the Spanish game (in the last 16), and of course when the president supports you it makes you comfortable and the players know this," he told his pre-match press conference ahead of Saturday's quarter-final against Croatia.
"It is just an extra boost in terms of motivation."
Cherchesov has been boosted by the return of midfielder Alan Dzagoev.
The CSKA Moscow star has not featured since a hamstring injury forced him off after 24 minutes of the 5-0 win over Saudi.
"It is a pity to lose such a player in the first game but he is already training," said the Russia coach.
"He missed training the day before yesterday but yesterday and today he trained and we will see if I am able to let him play from the first minute."