England have won their opening two games - scoring eight goals in the process - and are now the fourth favourites to go on and triumph at Russian Federation 2018.
"If I go and headbutt Roberto in the last five minutes then you'll know that we're maybe taking a different approach to getting through", he chuckled.
Group E has been settled, with Brazil's 2-0 win against Serbia pushing them into top spot ahead of a misfiring Switzerland, who could only draw 2-2 with Costa Rica but still go through in second spot.
"Not many players score a hat trick in the World Cup, so I'm extremely proud of that", he said.
Southgate knows how much that will mean to the defence-minded player, having headed to two World Cups as a squad member himself but only played at the 1998 tournament.
Since England's 6-1 defeat of Panama on Sunday, both are sure to progress from Group G to the last 16 with, for now, identical points and goal tallies for and against. Yet a troubled start for Germany means the Group G victor risks coming across either the defending champions or a feared Brazil earlier in the knockout rounds.
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They drew their first match 1-1 against Iceland with Messi missing a spot kick that would have seen him put his team in front. Australia still have a slim chance of progressing if they beat Peru heavily and Denmark lose to France.
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"It shows that with Italy and the Netherlands out before the tournament, Chile, who were in the Confederations Cup final, and now Germany, you can not relax and miss the opportunity to constantly improve".
"We just have to decide whether to put him back in or whether it is more beneficial for him to have a slower build up". I don't think it (Germany's exit) has any bearing on us. "We are extremely proud of each other really".
Harry Kane (24), Raheem Sterling (23), John Stones (24), Dele Alli (22), Jesse Lingard (25), Marcus Rashford (20) and Eric Dier (24) should all still be around in Qatar, with Trent Alexander-Arnold (19) and Ruben Loftus-Cheek (22) also emerging as stars of the future.
A second-placed finish for England would mean Sweden are potential opponents in the quarter-finals, should England get past a last-16 game against Japan, Colombia or Senegal.
Expect drama and entertainment aplenty after impressive displays from both teams so far.
"We think that we need to keep winning football matches and we want to breed a mentality where everyone in our squad wants to constantly win", he told a pre-match news conference.
"We have no idea who, when or where we will play", he said.