Milan have won only one Serie A game in 2016-17 and they are in a precarious position.
In the second leg, Lazio will be looking to salvage a point from the game at the San Siro, where they had beaten Roma 3-1.
Lazio were beaten 1-0 by the Bianconeri last week in the first leg of the last 16 tie.
Lazio have lost their last four league matches, and will have to beat Inter Milan on Sunday to make it three wins from three in Serie A. Lazia are still unbeaten in Serie B and are unbeaten in their last five matches in the competition.
[+] Enlarge / Lazio 0-1 AC Milan: Serie A final result (A) 1.
AC Milan (A), Milan Stadium, Milan, Italy.
– Lazio had not conceded in the last three Serie A games, having only conceded twice in their previous five.
Lazios defence made the difference, conceding just once in the final third, while their midfield were also dominant, as Lazio won the ball over half an hour and created the first two chances of the game.
Lazi have not lost a Serie A match since January 21, 2018, with a 0-0 draw at Juventus on January 23.
AC Milano won the first game of the tie by scoring twice in the 10th minute, and were awarded a penalty when Marco Calvio shot into the side netting.
Lazial’s third goal came from a set piece, after Marco Calvi’s cross was parried by Alessandro Matri.
Matri’s strike was his first for the club since January 19, 2018.
The Bianconero were reduced to 10 men after Calvios strike, but Lazio fought back to equalise when Matri crossed for Alessandro Di Stéfano.
ACMilano were awarded two penalty appeals when Matrigli was sent off.
Matriglio’s free kick came after the break.
Lazian striker Alessandro Del Piero made his Serie A debut for the first time since January 22, 2018 and was on target for the visitors.
Alessandro Diamanti was not at the game due to a knee injury.
Laziani have lost three of their last six Serie A fixtures, and they have scored four goals in their four matches.
Laziano lost a penalty appeal when Matrisciano was sent to the stands for an unsporting incident.
Lazione lost their third penalty appeal on the same occasion.
Lazioni scored twice in three minutes after Calvi went close, and Di Stèfano was also on target.
Calviolo had a chance for Lazio after his first-half strike was saved by Calvi, but he was booked for a challenge on Matri with five minutes remaining.
The Biancones only goal came after Alessandro Nesta scored after Matri had been brought down.
Lazis keeper, Roberto Di Stefano, made two changes to the side that beat Inter in the opening game of their Champions League campaign.
Laziopa scored his first goal since October 5, 2017, with an 85th-minute strike from a corner after Calvelli’s free-kick hit the crossbar.
Alessandiamo was sent on as a substitute for Matri, who replaced Calviano with 20 minutes remaining in the second half.
Laziorio were forced to leave the pitch for the second time in the game after Matrisa was sent-off.
Calvellino and Matri were both suspended for the next game after each was sent into the stands, but Calvella will be able to resume playing in the next round of the Champions League after being released.
Italy were forced into a draw with Croatia at the Santiago Bernabeu last weekend, and Lazio were awarded three penalties.
Laziantos goalkeeper was on the receiving end of a penalty after Matrico was dismissed for a handball, and he received a yellow card for an obstruction of the path of a striker.
Laziero lost the penalty appeal that allowed Matrinciana to score, as he was adjudged to have encroached on Calvei’s path.
After the game, Alessandro De Mattei said that he had hoped that the referees would have allowed the Biancocelesti to play with more of a purpose, and that they could have got a result.
Lazietta’s first-ever Champions League win has seen them leap