The coaching staff relied on specific physical protocols managed alongside a personal trainer brought in to monitor the player's recovery.
"And so there is a science behind how to recover from muscle injuries," said Marsch.
Marsch added that fulfilling these performance metrics gives the athlete the mental confidence required for high-stakes competition.
"What I said to (Davies) is I want him to go out on the pitch and be free, right?
And I think that if we hit the benchmarks appropriately with the correct timing, then that provides him with a better foundation that mentally and intellectually, he's done everything possible to prepare his body to be at his best," said Marsch.
The integration of specialized support staff was highly praised by management during the press conference.
"I think it's really important, especially when you're the level of athlete that Alphonso is, having somebody who knows specifically what the demands of your body are," said Marsch.
The collaboration with personal trainer Matthias Blankenburg has put the wing-back in optimal condition for the elimination round.
"And I think (Blankenburg's) been a huge help to Alphonso. And we see him now in great form and great fitness.
So, I think he's more than ready for tomorrow," said Marsch.
The coaching staff remains flexible on how the player will be utilized tactically against South Africa.
"He's a big X factor for us because he's such a big talent. He's very explosive in transition moments.
He's also a good footballer," said Marsch.
