Slot has insisted the injury is not a serious one, but the trip to Villa comes too soon for Gakpo.
Gomez, meanwhile, has been sidelined since January with a hamstring injury and Slot has now revealed that the defender may need to undergo surgery after suffering a setback and is set for a lengthy spell on the sidelines.
"Cody and Joe are unavailable for tomorrow," Slot said ahead of Liverpool's clash with Villa.
He (Gomez) will miss large parts of the end of the season but we expect him to be back in the end phase.
"He might (need surgery) but that's something we have to assess." Tyler Morton is also sidelined with a shoulder injury, but Curtis Jones will be back in contention after serving a one-match ban for his sending off against Everton(
Joe Gomez has suffered a setback in his recovery from a hamstring injury.
He did so well before his injury," Slot said of Jota.
"I couldn't even remember when his last start was for us in the Premier League.
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