The French midfielder, who previously played for Newcastle, appeared to stamp on the Brazilian's leg after tangling with him.
The incident was seen by match officials at the time, but no punishment was handed out by Martin Atkinson, meaning that no further action can be taken.
Sissoko played the full 90 minutes as his side won 2-1, but it was not a vintage performance from the midfielder.
Every misplaced pass was met with cheers of delight from the Newcastle fans, still upset about his unprofessional departure from their club two years ago.