Neither Croatia nor England are short of belief ahead of Wednesday's World Cup semi-final in Moscow.
Croatia are seeking to reach a first final, while England are out to emulate the country's 1966 winners.
The Croats need to recover from two energy-sapping extra-time matches and penalty shootouts to defeat England and reach Sunday's final at Moscow's Luzhniki Stadium - also the venue for Wednesday's semi-final.
England have not appeared in a World Cup last four since going out to West Germany in a penalty shootout at Italia 90, while Croatia have matched the team of 1998, who reached the semi-finals on the nation's World Cup debut following independence in 1991.
Croatia shone in the group phase, beating Nigeria 2-0 and Argentina 3-0 to make sure of progress to the last 16, allowing them to make nine changes for a 2-1 defeat of Iceland.
For many, they were among the title favourites at that stage, but penalties have since been needed to get past Denmark and hosts Russia.
"In the past six days, we have spent a lot of energy. We played two games, totalling 240 minutes, and it certainly will be a problem," coach Zlatko Dalic said.
"We will do everything to recover and I'm sure we will find energy for England."
England also made sure of early progress from the group stage after beating Tunisia 2-1 and Panama 6-1, allowing Southgate to rest players in the 1-0 defeat to Belgium.
England then overcame Colombia in a penalty shootout before defeating Sweden 2-0, and have the tournament's leading scorer in Harry Kane, who will now be closely watched by Liverpool centre-back Dejan Lovren.
"Every honour to Kane, he scored six goals, but we managed to stop (Lionel) Messi (of Argentina) and (Christian) Eriksen (of Denmark), and I hope we will also stop Kane as well," Dalic said.
Croatia may feel they have the edge in midfield, where Real Madrid's Luka Modric and Barcelona's Ivan Rakitic can expect to see much of the ball.
"We have strength and we're united on the pitch. Like one heart, one soul," Rakitic said.
England have looked strong at set pieces - eight of their 11 goals have come from set plays, including three penalties - and will have noticed that Croatia conceded from a free-kick in extra-time against Russia.
Now England have their tails up and, according to Manchester United wing-back Ashley Young, the players were always targeting the final despite many people being surprised at the Three Lions' success.
"We're creating our own stories. No player in the dressing room would have told you we're not confident that we would get there," he said.
"The squad and the staff have that belief, the team spirit and confidence to go as far as we want."