Southgate told reporters on Tuesday (Jul 10) that the most important thing was to keep things as normal as possible.
A much tougher test is expected in Moscow on Wednesday against a Croatia side that swept past Argentina in the group stages and boasts the midfield talents of Real Madrid's Luka Modric and Ivan Rakitic of Barcelona. "And we have a great opportunity now to get to a World Cup final".
Henderson said of England's semi-final opponents: "They have got some fantastic players".
Meanwhile, social media has been awash with support for the England team with several videos of celebrations following the win over Sweden going viral.
"I think he has been one of the outstanding performers so far in this World Cup".
Before their arrival in Russia, England had not won a knockout game since the 2006 World Cup.
Right-back Sime Vrsaljko came off in extra-time during Croatia's quarterfinal victory over Russian Federation and faces a race against time to be fit for the match against England tomorrow.
Harry Kane has to lead the group from the front, and now has a great chance of ending the tournament as the golden boot victor.
After overcoming Colombia in a penalty shootout, the first time England have ever done so in a World Cup.
Juventus striker Mandzukic is Croatia's main goal threat and although he has only scored once in Russian Federation, his game is about a lot more than just finding the net.
"Gareth's sideline style has meant our waistcoats are really scoring with our customers, with sales doubling since the World Cup began", said a spokeswoman for retailer Marks & Spencer.
The Three Lions' only worldwide title is the 1966 World Cup victory on home soil. - Eight of England's 11 goals at the 2018 World Cup have been scored via set pieces - since 1966, the only team to equal that number in a single World Cup tournament are Portugal in 1966 (also eight goals).
Henderson, if again selected as England's sole holding midfielder, will need to be at his disruptive best to prevent the Croatians developing a stranglehold in the middle of the pitch, while also watching out for those surging runs forward.
"But the feel of this group of players is very similar to the player we had [in 1996]".
However, Kane's partner in attack, Raheem Sterling, has pace to burn and England's totem will be on hand to benefit if that causes problems for the Croatians.
"I've played against Modric a few times, he's probably one of the best players I've played against", said Henderson.
The captain was the man of the match again in the penalty shootout win over Russian Federation in Sochi at the weekend.
But he is certainly well aware of the threat that Croatia pose in the center of the field.