The Duke of Cambridge, president of the Football Association, tweeted his support for the boys.
However, the biggest concern looking ahead to Sunday's game is bound to be fatigue, with Croatia having also required extra time and penalties to come through ties against Denmark and hosts Russian Federation in the past two weeks.
"Coach Zlatko Dalić has done a wonderful job, all the players are united and they're playing well".
Croatia will be looking to reach the World Cup final for the second time in their history if they beat England today. Fans in Flat Iron square in London jumped in the air and Box Park in Croydon went wild when the score in Moscow, Russia hit 1-0. I couldn't have asked for any more.
"I thought that we absolutely played them out the game in the first half. We will see after this practice session", he said.
However, Brosnan said he thought this year's team was different, and they would go forward more than they ever had in the past.
Sadly, it just wasn't meant to be for England at the 2018 World Cup.
Croatia opened at 60-1 World Cup odds to win the entire tournament; entering the semis, it was still the underdog at 4-1.
"In accordance to the Croatian and general law, Mr. Vrbanovic is innocent because the relevant judgment is not final and binding", the soccer body said in a statement to the AP.
Would Katich be able to sleep on Sunday night?
"Extra time, I knew it was on the cards we weren't going to win that".
With such a modest population, they are the smallest country to get to a World Cup final since Uruguay back in 1950, and in the modern game it is a staggering achievement.
The lone fan wearing a Croatia jersey, who watched with a co-worker donning an England shirt, said there was a great atmosphere in the room during the match.