Just three minutes into their 4-1 win against Fortuna Sittard, Zinchenko was on the wrong end of the heavy challenge.
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The immediate assessment is the Ukraine international has suffered a serious knee ligament injury.
Grim said afterwards, "I spoke to him briefly during halftime and again after the game. It's a really difficult time, something you wouldn't wish on anyone.
"He came here with the best intentions and, from day one, he has proven to be a true mentor to our young players."
Zinchenko cut short his loan with Nottingham Forest to leave for Ajax last month, joining from Arsenal for €1.5m.