But the Bayern Munich wing-back, who was yet to appear at this World Cup, remained glaringly absent from the starting line-up.
Still, Canada began on the front foot, racking up chances against South Africa’s low block.
In the 22nd minute, a pinpoint Eustaquio free-kick found Derek Cornelius wide open on the six-yard line. The Canada centre-back utterly mistimed his headed effort.
South Africa threatened sporadically on the counter. But in a frenetic period just before half-time, Canada came agonisingly close.
From a corner, Moise Bombito’s header was cleared off the line, before Tajon Buchanan’s follow-up shot was blocked by goalkeeper Ronwen Williams.
Moments later, Khuliso Mudau crashed into the dangerous Richie Laryea, but his penalty appeals were waved away.
That enraged a heavily Canadian crowd, and the jeers grew louder after half-time as South Africa were content to exchange deep passes under little pressure while the clock ticked down.
Just past the hour mark, Canada came close again.
Substitute Niko Sigur slid a through ball to Tani Oluwaseyi, whose shot was well-saved by the goalkeeper and looped up toward Jonathan David – but defender Mbekezeli Mbokazi just got there first and cleared brilliantly.
In the 75th minute, Davies finally appeared, to a huge roar, and made an immediate impact.
From the left wing, Davies found Jonathan David who laid the ball to fellow striker – and no relation – Promise David, but his shot went wide.
Moments later, Davies found Jonathan David again. This time, he shot from a tight angle, but was denied by Williams.
In the second minute of stoppage time, Canada finally broke through, from the other flank.
Jacob Shaffelburg raced down the right wing and pinged in a cross which was headed clear to Eustaquio.
The Porto midfielder – on loan at Los Angeles FC – chested the ball down and slammed it first-time into the bottom-left corner.
Canada’s bench streamed onto the pitch as the stadium erupted, celebrating a historic victory.
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