Lazio have been fined €140,000 and handed a suspended ban, while Tottenham were also fined €10,000 following crowd disturbances in their Europa League games.
UEFA confirmed the punishment for racist chanting and lighting fireworks in the stands during matches against Tottenham and Maribor.
If they receive another punishment over the next two years, the Biancocelesti will be forced to play a European game behind closed doors.
“The UEFA control and disciplinary body has issued a deferred decision ordering Lazio to play their next UEFA club competition match behind closed doors. This sanction has been suspended for a probationary period of two years.
“A fine of €50,000 was imposed on Lazio for the racist conduct of their supporters, ignition of fireworks and incidents of a non-sporting nature at their UEFA Europa League group stage game against NK Maribor in Slovenia on 6 December 2012.
“In another decision, Lazio have been fined €90,000 for the racist behaviour of their fans, throwing of missiles and-or fireworks, incidents of a non-sporting nature, late handling of their teamsheet and late arrival at the stadium at the UEFA Europa League group stage match against Tottenham Hotspur on 22 November, 2012 in Rome.”
Maribor were also fined €17,000 and Spurs €10,000.
Think you know your Italian football? Share your knowledge, tips and comments to win cash prizes in OLBG's tipster competition  - £5,000 monthly.