 He scored 15 goals in 30 matches and secured a transfer to powerhouses Lazio.Despite stiff competition within a Lazio side packed with quality strikers such as Marcelo Salas and Alen Bokšić, the rotation policy of manager Sven-Göran Eriksson ensured that Inzaghi would get playing time; he appeared in 22 out of 34 Serie A matches in Lazio's highly successful 1999–2000 season scoring 7 goals, as his team went on to complete the domestic Double by winning both the "Scudetto" and the Coppa Italia.In the Champions League, as Lazio progressed from both the first and the second group stages to reach the quarter-finals, Inzaghi scored 9 goals in 11 games (including four in a single game against Marseille on 14 March 2000, equalling the competition record held by Marco van Basten since 1992).