Serie A: El Shaarawy's last-gasp winner takes Roma to top of league table; Zlatan scores on comeback
Roma lead the Serie A table with three wins and 9 points. AC Milan also have three wins from as many matches.
Back in the Champions League after a seven-year absence, the club put the first tickets on sale this week at prices much higher than those of Serie A champions Inter Milan for their group games at the same stadium.
The 35-year-old announced his decision in a post on Instagram, which included a photo of a pair of boots, on Friday night.
Milan also said that Giroud "has not had contact with the rest of the team since the league match against Cagliari".
Messias arrived in Italy to live with his brother in 2011 and slowly rose through the lower reaches of Italian football — at one point transporting fridges for a living — before being picked up by Crotone in January 2019.
Serie A: Olivier Giroud's brace helps AC Milan beat Cagliari; Tammy Abraham scores in Roma's 4-0 win over Salernitana
France forward Giroud, who has not been picked for Les Bleus' upcoming World Cup qualifiers, bagged a brace in a 4-1 win over Cagliari at the San Siro while Abraham scored in a 4-0 rout at promoted Salernitana.
Looking assured in his new surroundings it was Mike Maignan's long pass that set up the only goal of the game, Davide Calabria then providing the assist with Sampdoria keeper Emil Audero unable to cope with Brahim Diaz's low shot.
Serie A: AC Milan to miss Zlatan Ibrahimovic’s services until end of international break, says Stefano Pioli
Veteran forward Ibrahimovic, who will turn 40 in October, has been out of action since injuring his left knee during Milan's 3-0 league win over Juventus in May.
Italian media put the cost of the loan deal at €1 million, with an option to make the move permanent after one year estimated at €4.5 million.
Donnarumma will be in competition for a place in Mauricio Pochettino's team with experienced Costa Rican Keylor Navas.
In Sunday's other high-profile friendly, Real Madrid and AC Milan fought to a 0-0 stalemate.
He scored two goals in 21 games in Madrid before joining Milan last season on loan, scoring seven goals in 39 appearances for the northern Italian outfit.
"AC Milan are delighted to announce the permanent signing of Fode Ballo-Toure from AS Monaco," last season's Serie A runners-up said in a statement.
The 34-year-old World Cup winner underwent a medical on Friday before signing with the Serie A runners-up who return to the Champions League next season after a seven-year absence.
Serie A: AC Milan director Paolo Maldini confirms Olivier Giroud's arrival, regrets Gianluigi Donnarumma exit
Olivier Giroud, a World Cup winner, is reported to be set to sign a two-year contract worth three million euros per season with the Serie A runners-up, who open next season at Sampdoria.
The Milan derby between Inter and AC Milan will take place on matchday 12 on 7 November with the return leg on 6 February.
The 22-year-old, who saved two penalties in the Euro final and was named player of the tournament, heads to France on a free transfer from AC Milan.
"Giroud is expected to be in Italy on Thursday to undergo medicals and sign the contract," wrote Sky Sport on its website.
Ukraine squeezed through to the last 16 despite taking just three points in the group stage, qualifying in part because Sweden beat Poland to top Group E ahead of Spain.
The 27-year-old midfielder told Turkey's TRT Spor that he will be in Milan on Tuesday to sign a contract after completing a physical with his new team.