Sacked coach Vladimir Petkovic is ready to take legal action against Lazio.
Petkovic insists this broke no rules, as his contract with Lazio was due to expire in June and his job as Swiss manager won't start until July 2014.
The Biancocelesti had to sack Petkovic before officially signing new boss Edy Reja so he can sit on the bench against Inter on Monday.
"We received notice of the sacking for just cause. We'll impound the decision in the opportune legal arenas, because we consider it profoundly unjust," Petkovic's lawyer Paco D'Onofrio told Sky Sport Italia.
"The statement released by Lazio is unique, as it doesn't actually indicate the rule he is supposed to have broken during negotiations with the Swiss Federation. President of the Coaches' Association Renzo Ulivieri also stated this week that Petkovic did not violate any regulation.
"No rule forbids a Coach from reaching an agreement with others when his contract is due to expire. Besides, Petkovic signed for a national team and not a club rival of Lazio."
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