Emphasis on mental aspect of the game, training to keep calm during big moments reasons behind strong show
The visitors will likely spend at least 3 billion yuan (USD 461 million) based on tickets, consumer services and inter-city transportation in Russia.
Salah, who hit a stunning 44 goals for Liverpool last season in all competitions, was forced out of the final in tears last month clutching his left shoulder after being wrestled to the ground.
Brazil will play two warm-up matches before travelling to Russia, with a friendly against Croatia at Anfield on June 3.
Among the measures taken by Iceland is the temporary postponement of all high-level bilateral dialogue with the Russian authorities, the foreign ministry said in a statement said.
Germany host Spain on Friday in Duesseldorf and Brazil in Berlin next Tuesday in high-profile friendlies, but will again be without their captain and goalkeeper.
While saying it will not be easy, his goal was to maximise the abilities of the "physically strong" players to win games.
Spain will kick off its World Cup campaign in Group B against Portugal on June 15 in Sochi on Russia's Black Sea coast.
Bayern paid Hoffenheim around 13 million euros ($16m) for Wagner earlier this month and the burly 30-year-old has played just 24 minutes of Munich's two Bundesliga games so far in 2018.
Italy need to overturn a 1-0 play-off first-leg defeat against Sweden at the San Siro on Monday.
Sergio Ramos believes his country is just one win away from assuring a place in the 2018 World Cup finals.