Tempers flared up just before the break after Lukaku got angry by a foul by Milan defender Alessio Romagnoli.
Ibrahimovic stepped in and squared up to Lukaku, his former teammate at Manchester United, with the pair going head to head while exchanging words.
Lukaku could clearly be heard telling Ibrahimovic: “Well let’s go inside you b*tch!”, in an invitation to engage in a further confrontation in the tunnel.
Ibrahimovic muttered some words to Lukaku possibly in Italian while Lukaku was heard saying “I’ll f*ck you and your wife you b*tch”-
The argument was so much that both players continued to be restrained as the teams went down the tunnel for half-time.
Lukaku and Ibrahimovic were team-mates at one point, playing together at Manchester United during the 2017-18 campaign.
Watch the incident below
