OFFICIAL: Giroud is included in the Serie A's best XI of the week as goalkeeper
France international Maignan picked up a late red card during the San Siro clash for a foul on Caleb Ekuban in stoppage time, after the club had used up all of its substitutions.
Stefano Pioli was forced to turn to one of the on-field players and Giroud was the man to don the bright green goalkeeping shirt.
Now, the striker's last-gasp save to deny Genoa's George Puscas has earned him a spot in goal for Serie A's team of the week.
As well making team of the week, Giroud's stint in goal ensured Milan took away all three points.
America international Christian Pulisic scored the only goal of the game with a well taken finish three minutes from time.
Milan were quick to capitalise on his surprise star turn, listing the player under the 'goalkeepers' section in the squad on their website, and allowing fans to buy goalkeeping kit with his name and number.
But shortly after the decision was shared on social media, supporters flocked to snap up the shirts, and they have quickly sold out.
I've never experienced that in my career and I'm proud of the whole team,' Giroud said. 'We fought like lions.
'The final stop? I made a great save at the end. (The stop felt) almost like a goal.
'I said to myself, "Go, better to go out than stay in goal”. I don’t have the automatisms of a goalkeeper but I felt it that way. Puscas massacred my arm but it's okay.'
What do you think of Serie A's choice? 😁