"The disciplinary committee found that Hartley had committed a reckless act of foul play in that he had struck Slimani in the face, however the committee was not satisfied that the offence had warranted a red card," EPCR said in a statement.
"The citing complaint was therefore dismissed and Hartley is free to play."
Prop Joe Marler was suspended for three weeks and will miss the first two England tests of the three-match series - against Argentina and Australia - after striking Wasps' Will Rowlands with his elbow in Harlequins' 41-10 Champions Cup loss on Sunday.
England and Wasps number eight Nathan Hughes is also facing disciplinary action for an allegedly dangerous tackle on Quins fly-half Marcus Smith. The case will be heard later on Wednesday.
Eddie Jones names his England squad for next month's internationals against Argentina (Nov. 11), Australia (Nov. 18) and Samoa (Nov. 25) on Thursday.
(Reporting by Hardik Vyas in Bengaluru; Editing by Ken Ferris)
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