Stefano Pioli's wait for his first win as AC Milan coach continues after Davide Calabria's error gifted Roma a 2-1 victory in Sunday's Serie A encounter.
Having come on shortly after half-time, right-back Calabria made an immediate impact when he teed up Theo Hernandez's equaliser in the 55th minute at Stadio Olimpico.
Hernandez's effort cancelled out Edin Dzeko's first-half opener, but Calabria ruined his good work when his loose ball enabled Nicolo Zaniolo to restore Roma's lead.
Gianluca Mancini's poor miss kept Milan's hopes alive but their new coach failed to inspire a comeback as the Rossoneri remain entrenched in the mid-table.