England captain Harry Kane insists he will use the World Cup as a platform to prove his quality as he aims to reach the levels of Cristiano Ronaldo and Lionel Messi. And that is an issue which is beginning to rear its head for Southgate ahead of Sunday's clash with Panama in Nizhny-Novgorod. "But I believe the best teams in the world have that belief in what they are doing and in the end they break teams down".
But if you scratch beneath the surface with England, you will not find much depth in the goal scoring department outside of Kane.
Welbeck was arguably the last man on the plane and the likes of Jamie Vardy and Marcus Rashford will get the nod before the 27-year-old.
One win inspires most Englishmen to conclude that an opening win in Group G means the rest of the world will be quaking in their boots at the prospect of taking on Harry Maguire, Jesse Lingard and the rest of Southgate's "dream team".
Sterling is proving to be a puzzle for Southgate, though.
In addition to an inability to keep the ball and a tactical illiteracy, one of the reasons cited for England's failures at major tournaments has been that the players become bored.
And, having carried that form into the World Cup, Kane - who failed to find the net at Euro 2016 - claims to have put no limits on what he can achieve. Yes, there have been changes off the pitch in recent years but when it comes to playing the match, you'd have to say it was similar to previous regimes: a lack of energy, ideas and penetration.
England players celebrate in wild scenes.
Kane said he received a surprise message from Spurs boss Mauricio Pochettino before the the Tunisia game.
Kane's confidence will be a boost to England boss Gareth Southgate, who has taken a vibrant but relatively inexperienced squad to Russian Federation.