ROME — Riots in Rome last week have sparked extra anti-violence measures for several of Thursday's second-leg matches in the Europa League's last 32.

Police in Rotterdam are tightening security and drafting in reinforcements ahead of a highly charged match between Feyenoord and Roma after Dutch fans destroyed a 400-year-old fountain before the first leg last week, which ended 1-1.

The problems in Rome have prompted worries over artistic treasures in Florence ahead of Tottenham's visit to Fiorentina following a 1-1 draw in London.

With 2,200 Tottenham supporters expected in the Renaissance city, Florence officials will be posting extra police around the historic center's monuments and museums.

And with Celtic heading to Milan to face Inter after a 3-3 first-leg draw, the Scottish club's assistant manager John Collins warned supporters that itis "vitally important" to behave in the northern Italian city.

Celtic was fined 10,000 euros ($11,000) by UEFA for crowd disturbances at a match in Croatia with Dinamo Zagreb last year.

Inter has won three straight in Serie A but is still eighth in the Italian league, meaning its best route to qualifying for the Champions League could come by winning the Europe's second-tier competition.

Roma and Tottenham will each be seeking smooth nights so they can prepare for a couple other big upcoming matches.

Tottenham faces Chelsea in the League Cup final on Sunday while Roma hosts leader Juventus on Monday in a 1 vs. 2 matchup in Serie A.

Elsewhere, Liverpool visits the Ataturk Olimpiyat Stadium in Istanbul for the first time since its win in the 2005 Champions League final