Salah was forced off on 59 minutes with a suspected hamstring injury.
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"Another win and another injury. It's the story of our season," Slot told Match of the Day.
"It's too early to say but we all know Mo and how hard it is for him to leave the pitch. For Mo to leave the pitch, it shows you something but we have to wait and see how bad it is."
Salah will leave Liverpool this summer - a year before his contract is due to conclude - after reaching an agreement with management.
If it is a hamstring strain, it is likely to leave Salah sidelined for at least a month, if not longer.