Claude Puel insisted Inter Milan's Antonio Candreva should have been sent off for appearing to strike Sam McQueen during Southampton's 2-1 Europa League victory.
The manager did, however, also say he did not see Inter's apparent attempts to tamper with the penalty spot in the build-up to Dusan Tadic's saved attempt.
Southampton moved to the brink of the competition's knockout stages after a famous, comeback victory over one of Europe's biggest teams.
Virgil van Dijk's equalising goal and an own goal from Yuto Nagatomo secured three vital points after Mauro Icardi had given Inter the lead.