Quins flanker Will Skinner was sent off during the closing stages of the 31-24 victory by referee Alain Rolland as, after being substituted earlier in the game, he prevented Toulouse from taking a quick throw as they desperately sought a late score.
Skinner was subsequently handed a two-week ban for "an act contrary to good sportsmanship", but a European Rugby Cup investigation into other incidents in the Harlequins' technical area during the game decided that no further punishment was required after the Aviva Premiership club took internal disciplinary action over the matter.
But Harlequins have been warned over the future conduct of their staff and players in and around the technical area.
An ERC statement read: "Harlequins co-operated fully with the investigation, and following internal disciplinary action taken by the club, ERC's disciplinary officer, Roger O'Connor, has decided that no further action is required.
"However, the club has been warned as to the future conduct of its staff and players in and around technical zones."
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