Nerazzurri went into the second leg of their semi-final clash with Derby della Madonnina on Tuesday with a 2-0 lead.
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The forward was ruled out for a couple of months after the horrific clash of heads with Inter defender Milan Skriniar in late November left him with shocking injuries.
The Denmark international was playing in the the Euro 2020 game with Finland in June when he suddenly collapsed.
The former Inter and Milan striker returned to Serie A in August 2019, when he signed a deal with Brescia.
According to ForzaRoma.info, Nainggolan lost control of his black Ferrari GtC 4 Lusso on the A1 motorway near Arezzo in northern Italy.