Marco Parolo scored twice as Lazio heaped more woe on Milan, who had Philippe Mexes sent off in a 3-1 defeat.
Lazio came from behind to pick up a deserved three points against a faltering AC Milan side, winning 3-1 on Saturday.
QPR manager Harry Redknapp has confirmed he was offered Alexandre Pato, but he will not move for the Brazilian forward.
Manchester United have reclaimed second spot in the list of the world's richest football clubs, compiled by Deloitte.
AC Milan coach Filippo Inzaghi has taken full responsibility for his team's slow start to the new year.
Juventus moved five points clear in Serie A with a 4-0 win over Hellas Verona on Sunday, while Sampdoria beat Parma.
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