After a string of impressive performances, Poborský moved sides in January 2001, joining Serie A's Lazio. Whilst at Lazio he played a key role in the destination of the 2001–02 Serie A title. On the final day of the season Inter Milan were playing at Lazio knowing a win would give them the title. However Lazio won 4–2, with Poborský scoring twice, and the title went to Juventus instead. In July 2002, he returned to his homeland, signing with Sparta Prague, where he became the highest-paid footballer playing in the Czech Republic. He subsequently returned to his first club, Dynamo České Budějovice, scoring two goals and setting up a third on the way to a 4–0 victory against Sigma Olomouc B in his first match. He retired on 28 May 2007 after a match against another former side, Slavia Prague.