Lazio have denied claims of tension between coach Simone Inzaghi and president Claudio Lotito.
A video has emerged of the pair arguing.
“At the beginning of this season it's particularly 'hot' against Lazio," club spokesman Arturo Diaconale said.
“All events are blown out of proportion and robbed of their specific meanings. The first aspect is included in the statement: it's not acceptable for a private conversation to be filmed and distributed in this way.
“We must defend everyone's right to privacy: we'll proceed with the legal route.
“The other point is related to the content. It's part of a normal discussion between a President and a Coach.
“Every Coach wants to have 11 Ronaldos, and at the same time a President sometimes has to say that it's not possible.
“There is no conflict between Lotito and Inzaghi, there was a discussion but it doesn't affect their relationship and I hope it will not disturb the team on the eve of a delicate match.
“Claudio Lotito is a passionate guy, we all know that, he can get caught up in a heated discussion in the moment, then after a minute return completely to normal.
“The relationship is completely normal, it would be absurd if there wasn't this dialogue.
“You can't transform normal discussions into a Third World War. We concluded the transfer market with the full satisfaction of the Coach, having resisted overtures for Milinkovic-Savic.
“Inzaghi is one of the most balanced people I know, on Friday he'l be asked questions in the Press conference, but we do not want to further fuel this story."