Fabio Borini completed AC Milan's triumph over Ludogorets Razgrad, with a 1-0 home victory capping off a 4-0 aggregate win.
Borini scored following a counter-attack in the 21st minute, turning in a Patrick Cutrone cross at the far post.
"I am happy we kept a clean sheet, as that's something I was focusing on in training lately," coach Gennaro Gattuso told Sky Sport Italia.
"It's good that nobody had a cramp after 90 minutes, but it's about attitude too. I am very, very happy with the growth...
AC Milan eased to a 3-0 victory away to Ludogorets Razgrad to open their Europa League round of 32 tie on Thursday.
Patrick Cutrone scored in the first half before Ricardo Rodriguez and Fabio Borini added goals after the break to give the Rossoneri a sizable advantage.
Milan worked the ball around from a shortly taken corner and Cutrone headed home to put Milan ahead just before half-time.
In the second half, Cutrone drew a penalty that Rodriguez converted in the 63rd minute, before Borini volleyed...
One year after reaching the group stage, Ludogorets Razgrad lost the first leg of their opening Champions League qualifier on Wednesday.
The Bulgarian champions will have to recover from a 2-1 defeat away to Lithuania's Zalgiris Vilnius after conceding twice in the final 12 minutes.
Other clubs with European pedigrees prevailed as they opened the second qualifying round on Wednesday.
Legia Warsaw got first-half goals from Guilherme, Dominik Nagy and Kasper Haemaelaeinen to cruise to a 3-0 win at...
Zlatan Ibrahimovic's hat trick gave Manchester United a 3-0 win against St Etienne in a Europa League round of 32 first-leg clash at Old Trafford on Thursday.
Ibrahimovic opened the scoring in unusual circumstances after 15 minutes when his free kick struck the St Etienne wall and deflected towards goal leaving St Etienne goalkeeper Stephane Ruffier wrong-footed and stranded before crawling over the line.
He added an important second in the 74th minute as substitute Marcus Rashford squared from...