Argentine will coach in Italy for the first time.
Lazio have appointed Marcelo Bielsa as their new coach.
The 60-year-old Argentine, whose most recent managerial position was in France with Marseille, will start work on 9 July.
“As revealed by news in the media today, SS Lazio announces that it has already deposited the contract of Marcelo Bielsa and his staff,” read a statement on Lazio’s website.
“The club also announces that, as per the communication received, the coach and his staff will be in Rome on Saturday July 9.”
Earlier, Lazio’s press spokesman Stefano De Martino said that the paperwork had been completed and Bielsa would fly to Italy at the weekend.
“He will arrive on Saturday morning and move into Formello [training centre] in the evening,” he said. “The day after, he will travel with the team to Auronzo di Cadore for the first stage of our summer training camp. We will give more precise timings later on, but this is the news.”
Lazio finished eighth in Serie A last season, but had been without a permanent manager since Stefano Pioli was fired in April.
Bielsa led Argentina to an Olympic gold medal in 2004, before guiding Chile to the 2010 World Cup in South Africa.
He took Athletic Bilbao to the 2012 Europa League and Copa del Rey finals, but had been without a club since leaving Marseille in August 2015.
He had been linked with a return to the Argentina national side but will instead begin his first spell in Italian football.