And the 2016 England Player of the Year - who was named on the six-man back-up list to Southgate's 23-man selection for this summer's tournament in Russian Federation - is confident he would have been on the plane if not for his lack of games.
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And two of those substitutes - Alli and Welbeck - combined 15 minutes from the end when the Tottenham man crossed for his club rival to nod home and seal the win.
A sold out Elland Road was treated to its first England worldwide since 2002 - and boy did the locals enjoy it.
"I think the injuries one is obviously something that's a nasty one and can crop up at any time, and to get through the two (warm-up) games and have nothing is a great sign".
Gareth Southgate's side are now unbeaten in their last 10 games, which includes matches with Germany, Brazil and Italy.
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With around 20 minutes of the game still to play, Costa Rica brought the 20-year-old defender on as a substitute.
And given England's World Cup routes, whether winning or coming second in group G sees them likely to face either Brazil or Germany in the quarter-finals (should they get that far and both teams win their groups as expected) this will be something Southgate needs to work on in the final days before they travel to Russian Federation.
"He made 10 changes for the Costa Rica game and you saw an identical performance to the one against Nigeria".
"My wife knows - they all know - that this is what I do, this is what I enjoy doing and this is the biggest tournament in the world".
Costa Rica were the opponents in Leeds and were beaten 2-0.
Gareth Southgate's men begin their World Cup campaign against Tunisia in Volgograd on June 18, a game you can hear live on talkSPORT.
Real Madrid goalkeeper Navas was completely caught out moments later, though, as Rashford unleashed a powerful drive from 25 yards for his third worldwide goal.