The giant banner, which was unfurled before kick off, showed a man holding a sword and a cartoon of Defour's severed head with the words "Red or Dead".
The 26-year-old Belgium international apologised for his actions on Instagram saying: "Apologies to my fans... although I do not understand the red card -- you can not see or hear the referee."
Former Standard captain Defour joined arch rivals Anderlecht in August after spending three years with Porto.
(Reporting by Michael Hann; editing by Toby Davis)
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