If the match confirmed what Southgate knows about Rashford, it also showed the England manager that there is clear daylight in the pecking order between Jordan Pickford and Jack Butland.
Switzerland were soon gifted a chance to settle into the game, though, as Jack Butland's attempts to play out from the back nearly backfired twice in quick succession - the second of which saw James Tarkowski robbed of the ball and Xherdan Shaqiri subsequently fire a low strike against the outside of the post when he should have done better.
"Their movement was really good, they kept the ball really well and we had to chase too much [in the first half]".
A number of changes were made to Gareth Southgate's side as the England boss looked to experiment with a number of inexperienced players such as Trent Alexander-Arnold, James Tarkowski and first team debutant Ben Chilwell, who came on as a second half substitute.
Danny Rose and Harry Maguire revealed England's players exchanged stern words at half-time before emerging as 1-0 winners against Switzerland on Tuesday night.
The Liverpool clash will be a real test of Tottenham's title credentials this season as Jurgen Klopp's men sit top of the Premier League table having taken a maximum 12 points so far, so Pochettino will be desperate to have Alli fit for the game.
While England had an impressive summer campaign at the World Cup, defying all expectations to reach the semi-finals over in Russian Federation, they did so with a relatively young and inexperienced side. "We had a real jigsaw of minutes to piece together, when to put people on or take them off, and we've got them through the game".
"They were frustrated in the first half, but I always knew that was a risk".
"Before I got in the players were trying to sort things out", he continued.
The tempo fizzled out towards the final 15 minutes of the second half, with the Swiss showing no real attacking threat despite being a goal down.
One fan did, however, not buy into the global friendly hype.