England made a perfect start to their Euro 2020 campaign this weekend by beating 2018 World Cup heart-breakers, Croatia, at Wembley Stadium.
Months of national speculating and debating came to a close when Southgate named his starting XI, but discussion quickly picked back up over some surprising inclusions and omissions.
One major talking point was Southgate's decision to field Kieran Trippier at left-back - leaving Premier League Team of the Year candidate, Luke Shaw, on the bench while omitting Champions League winner, Ben Chilwell, from the squad entirely.
Further discussion stemmed from Raheem Sterling being handed a start on the left wing, which left both Marcus Rashford and Jack Grealish on the bench and Jadon Sancho with no spot in the squad at all.
But both Sterling and Southgate answered their critics in style. The Manchester City winger looked sharp all match and latched onto Kalvin Phillips' through ball to net the game's only goal, and hand England their first ever win in a Euros opener.
Perhaps rather surprisingly, England got the job done, and looked good while doing it. But with a long summer ahead and Southgate likely to rotate the side, Planet Sport predicts who could start for England in their grudge match against Scotland.
Nailed on. In a squad full of talent and versatility, Pickford is one of only a few definite starters. Despite being relatively untested in the Croatia match, Pickford looked confident in both his shot-stopping and distribution.
In a somewhat new-look England defence, Pickford is trusted by Southgate and brings both experience and leadership to the side.
At times, looked like England's weakest link on the pitch. But after improvement in the second half, Walker picked out Phillips for England's goal.
With plenty of depth at right-back, you'd think Walker's performance against Croatia is enough to warrant Reece James a start. But with his experience on the international stage, and enough pace to cover for any of the England defenders, Southgate will probably opt for Walker again against Scotland.
With the latter out injured, and likely to not return in the group stages, it's even more important that Stones is ever-present in the back line.
It looked as though he picked up a slight injury towards the end of the match against Croatia, but until England are guaranteed to qualify from the group, it is unlikely he'll be handed a rest just yet.
With Maguire out injured, whoever was selected as Stones' defensive partner was bound to be under the media spotlight when the squad was announced.
After two less-than-convincing performances in the pre-tournament friendlies, Mings' inclusion in the squad was understandably met with some uncertainty.
But the Aston Villa defender proved to be a solid foundation for Southgate's side on Sunday afternoon, and although he isn't perhaps first-choice when everyone's fit, his performance earned him the chance to start against Scotland this Friday.
With Shaw being named in the Premier League Team of the Year, and Ben Chilwell playing a pivotal role in Chelsea's Champions League success this season, many thought the left-back spot was going to be hotly contested between the duo.
So when Southgate named Kieran Trippier as England's left-back in the opening match, the nation's eyes understandably widened. Admittedly, the Atletico Madrid defender has had a superb season, but with an abundance of talent already at left-back, it was a shock to see him fielded in an unnatural position.
Despite the question marks looming over his head, Trippier performed well against Croatia, and looked a threat going forward. But with rotation necessary going forward, and fresh legs required for a presumably physical match against Scotland, Shaw offers Southgate a great option at left-back.
Shaw's inclusion over Chilwell in the squad this weekend was enough of a hint to suggest that he is Southgate's preferred option of the two, and for that reason we expect him to start against Scotland this Friday.
Essential. Rice has quickly become England's best midfielder, and is hugely important when it comes to team balance.
His ability to sit and protect the defence gives license for others to go forward and create, notably his midfield partner Kalvin Phillips, who was integral in England's goal on Sunday.
After a man-of-the-match display against Croatia it's hard to leave him out. Initially, Phillips' inclusion in the starting XI was surprising, but he quickly removed any doubt, controlling the centre of the pitch against world-class opponents.
His energy and tenacity in midfield was unmatched and proved too much to deal with for both Luka Modric and Mateo Kovacic. With a physical game on the horizon against Scotland, Phillips could prove vital in England's success.
Phillips' partnership with Rice looks promising for England, and with the duo playing like that, Henderson could struggle to find a spot back in the starting lineup. Frankly, Phillips' assist for Sterling's goal was just the cherry on top of an amazing performance.
His link-up play and passing was generally excellent during the Croatia match, and he's even shown his desire to work back and defend.
After taking both corners and free-kicks for the side, it appears as though Mount is also Southgate's go-to option for set-pieces in the tournament - another hint that Trippier could potentially be dropped.
With the likes of Jack Grealish, Phil Foden and Marcus Rashford all itching for gametime, it's likely that Mount will be rested at some point during the tournament, but after a faultless performance this weekend, we see him retaining his spot.
Was initially questioned as a starter following a disappointing season with Manchester City, but answered all his critics in style with a match-winning goal.
Despite his end product lacking consistency, Sterling looked bright all game and his relentless running caused Croatia problems all afternoon.
With 62 caps under his belt he provides the side with valuable experience, and after struggling in previous tournaments, he's now proved he can turn up in vital moments.
Undoubtedly, Sancho and Rashford will both get more and more minutes as the tournament progresses, but after netting the winner, Sterling has earned his shot at doing it again against the Scots.
Never in doubt. Even after missing a huge chance against Croatia this weekend, he's the team's captain and best proven goalscorer.
The quicker he gets off the mark, the better for Southgate. Kane will be looking to set things straight and amend his miss on Friday evening.
Foden, looked like England's brightest spark in the opening minutes against Croatia, although that might have just been his hair.
He was unfortunate not to hand England an early lead when his shot fired back off the inside of the post, but as things went on, he slowly drifted in the game before being subbed for Rashford in the 71st minute.
As we've learned with Grealish in an England shirt, he doesn't let the game slip away from him, and after a man-of-the-match performance against Romania in the pre-tournament friendly, he deserves a shot against Scotland.