Lazio have been ordered to play their next two home European matches behind closed doors following an investigation by UEFA into crowd trouble during their Europa League last-32 match against Borussia Monchengladbach.
The Serie A club had been charged over the setting-off of fireworks, racist behaviour and insufficient organisation following the second leg in Rome six days ago, which Lazio won 2-0 to progress 5-3 on aggregate.
The crowd ban will apply to their next home fixture on March 14 against Stuttgart in the last 16 of the competition, while the club were also fined 40,000 euros (£35,000) by UEFA's control and disciplinary committee.
It is not the first time Lazio fans have fallen foul of European football's governing body, with the club having previously been punished for racism offences in matches against Tottenham and Slovenian side Maribor.
Fenerbahce will also have to play their next home European match in an empty stadium following a charge of throwing fireworks in their recent Europa League clash against BATE Borisov.
In addition, the Turkish club were fined 60,000 euros (£52,000) while they were also excluded from participating in the next UEFA club competition for which they qualify - a sanction that is deferred for a probationary period of two years.
Lazio and Fenerbahce were given three days to appeal against the decisions.
On a busy day for the disciplinary committee, Paris St Germain striker Zlatan Ibrahimovic was handed a two-match ban for his red card in the Champions League clash with Valencia on February 12.
He will now miss the second leg of the last-16 fixture next week.
Fenerbahce midfielder Raul Meireles is facing a three-match ban after he was sent off against BATE, while defender Cesar Navas will miss three games for his club Rubin Kazan after he was also dismissed in the last 32 of the Europa League against Atletico Madrid.
However, UEFA dismissed a protest from Schalke over the eligibility of Didier Drogba in their Champions League match against Galatasaray.
The Bundesliga club had argued the Ivory Coast international did not have permission to play in the tie on February 20 following his transfer to Turkey from Shanghai Shenhua, but those claims were today rejected.