Edy Reja has taken charge of his first training session as Lazio coach.
Training resumed after the Christmas break and ahead of the January 6 encounter with Inter, which is set to be Reja's debut.
"Lazio have taken legal action to contest Petkovic and we await his response before evaluating alternative solutions," club lawyer Gian Michele Gentile told lalaziosiamonoi.it.
"The letter is a disciplinary action because he denied a fact that had occurred, namely signing a contract with the Swiss Federation.
"For the moment there is nothing defined. There is no chance he will be at the Formello training ground. None.
"He has been given five days to respond to this letter, so at this point we'll discuss it again after January 6..."
