The coaches became embroiled in a heated row towards the end of the tie.
After the game, Mancini, who was sent off and has been fined 5,000 euros for his "intimidating" role in the confrontation, accused his opposite number of making homophobic insults.
But the ruling by a sporting judge, refers to "highly offensive" comments and does not mention homophobia, for which the punishment could have been greater.
The clash appeared to occur after Mancini questioned the fourth official, who mistakenly indicated nine minutes of added time before changing his mind and indicating five instead.
($1 = 0.9228 euros)
(Reporting by Silvia Recchimuzzi in Gdynia,; Editing by Neville Dalton)
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