Slimani seemingly kicked out at West Brom defender Craig Dawson in the final ten minutes, as Newcastle hosted the 'Baggies' at St James' Park on Saturday.
The incident was missed by match officials, but picked up after the fixture and the 29-year-old will have until 6pm on Tuesday to respond to the decision.
The retrospective three-match ban means that the Algeria international will not be seen in the Newcastle shirt again having been loaned out for one season from Leicester back in January.
April 28, 2018