Croatia struggled to find rhythm in their penalty shootout knockout game victories against Denmark and Russian Federation with boss Zlatko Dalic claiming the defensive style of their opponents stifled their creativity.
"The most important thing for me is that my national team succeeded and that we do something big".
Dalic must rouse his players after the physical demands of their two knock-out wins.
While semi-final excitement reaches fever pitch at home, what is it like to be an Englishman living in Croatia?More news: Zsa Zsa, the world's ugliest dog, has died
Redknapp says Gareth Southgate was correct to field a weakened team in the final group game against Belgium - who lost their semi-final to France on Tuesday - which resulted in England finishing as runners-up.
But this is a player whose reputation took a battering at home before the tournament due to his implication in the multi-million-euro corruption trial of former Dinamo Zagreb chief Zdravko Mamic. The offence carries a penalty of up to five years in jail. Modric is one player England need to stifle if they harbour any dreams of prolonging their stay in Moscow.
But Dalic accepted the late finish of Croatia's quarter-final, coupled with extra-time exertions against Denmark, will pose his squad a physical challenge ahead of Wednesday's semi-final in Moscow.
"We took a hard route and we were unlucky, particularly in previous tournaments, especially the Euros". To their credit, they didn't give up and an equaliser deep in the second half of extra time reignited their hopes of a last four spot.More news: #WorldCup - Croatia vs England preview
And Jenas, who now works as a pundit for the BBC, thinks England must negotiate a tie featuring the best midfielder in the world football if they are to get there.
'I didn't see him becoming the best centre forward in the world, which is what he has become, ' Redknapp said. "Hopefully it will be us".
"It's amusing because at first I didn't think I did look like him, but with all the people approaching me about it they can't all be wrong!"More news: Meghan dazzles in Roland Mouret on day two of her Dublin visit