With 45 points, Lazio is five points behind Atalanta, six behind Inter, and nine behind leaders Napoli, who will host Udinese at the Maradona on Sunday.
Adam Marusic, Pedro, Valentin Castellanos, and Fisayo Dele. Bashiru all scored goals for the Biancoclesti.
Monza, who are currently 13 points behind second-last Venezia, six behind third-last Parm, and seven behind fourth-last Empoli, received a consolation goal from Stefano Sensi.
Lazio defeated bottom-place Monza 5-1 at the Olimpico on Sunday, moving them back up to fourth place in Serie A.
