Vincenzo Montella explained that Marco Storari's experience was the reason AC Milan signed the 40-year-old goalkeeper until the end of the season.
Storari, who previously spent time at Milan from 2007 to 2010, re-joined the club from Cagliari on Tuesday, with shot-stopper Gabriel going the other way on loan until the end of June.
And he will now serve as deputy to Milan's teenage keeper Gianluigi Donnarumma.
"I have known Storari for a long time, we wanted to send Gabriel out on loan to play and then we learned of this possibility," coach Montella said at a media conference.
"Marco knows the environment and can be important both on and off the field. He knows what it means to play for AC Milan and I am sure that his experience will come in handy."