Maldini is to move to the Serie B outfit on-loan to the end of the season.
Calciomercato.com says the 20-year-old is seeking more playing time and is open to leaving the Rossoneri on loan in January.
SPAL have opened talks with Milan and are close to securing his services on a temporary deal until June.
Maldini has played 219 minutes across 11 appearances this season, scoring one goal.
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