UEFA was not available for comment but Lazio President Claudio Lotito told Italian radio the suspended ban, which will be enforced if a similar incident takes place, was a warning to his club's fans.
"For the fault of a few people, we all must pay the penalty. But now there is no more joking," he said.
Tottenham have a large contingent of Jewish fans. Lazio supporters, well-known for their right-wing views, also unfurled a "Free Palestine" banner at the game.
Ten Spurs fans were injured when they were attacked in a Rome bar the night before the match.
UEFA has been accused of being too soft on racist incidents, with pundits pointing out that Denmark's Nicklas Bendtner was handed a bigger fine for displaying an advertising logo on his underpants at Euro 2012 than national federations have received for instances of racism.