His biggest moment in an England shirt came at the World Cup in Russian Federation this summer, when he scored the second goal in the Three Lions' quarter-final win over Sweden.
The excitement of the Three Lions' run to the World Cup semi-finals was a distant memory in a friendly match that allowed England to at least put behind them defeats to Croatia, Belgium and Spain. But while there were some satisfactions - among them a first clean sheet in four games - England remain a work in progress.
"He'll return to Spurs for further treatment, with no further additions to the Three Lions squad planned".
It was Rashford's fifth goal for England in 27 matches.
"It was important then that we solved a couple of the problems they were facing and kept things calm. There was plenty of room for improvement". Southgate admitted sympathy for the Croatians, who he believes are having similar difficulties to his own side after going so far at the World Cup in the summer.
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As things stand, Thomas would be a free agent after this season, and it's all but a foregone conclusion he'll leave town. Wednesday's news of Thomas reporting to his current team might well lead to both sides considering it a stalemate.
Why is England vs Switzerland at King Power Stadium?
"It's great we can all shout at each other and tell each other to improve like we did", he said. Clearly ill at ease with the ball at his feet, the Stoke man nearly passed the ball into his own net in the sixth minute and his under-hit pass to James Tarkowski seconds later culminated in Xherdan Shaqiri hitting the post for the visitors.
But his side, containing nine changes from the weekend, was struggling even to cope with the Swiss' passing and movement as the visitors enjoyed almost 65 percent possession before the break. The victor came on 54 minutes when Rashford, who scored England's goal against Spain, arrived at the far post to turn in Kyle Walker's cross.
With their rendition of Atomic Kitten's "Whole Again" in tribute to Gareth Southgate on loop for nearly the entire game, Rashford's goal was a rare moment of respite.
Shaqiri came closest to an equaliser but saw his fierce strike bravely blocked by John Stones as England held out for victory.