The Italian was brought to the Stadium of Light in the summer transfer window, but so far he has generally been utilised in a wide role.
However, Advocaat has said that his long-term intention is to deploy Borini as an out-and-out striker, but he is still trying to assess where he performs best.
“We bought him as a striker," Advocaat said. "They told me he is a central striker who can play on the sides.
"Now normally you have a pre-season but now we have to find out what is best for the team while the season is going on. 4-3-3 or whatever; if you bring in new players you have to start as quickly as possible to find out your options.
“I have seen Fabio play centrally in one game and let’s see what he will do.”
Borini has the quality to push Sunderland up the Premier League table, but his arrival does not seem to have sparked the team into life.
The Black Cats still look short of quality up front, and there is pressure on the former Liverpool man to start finding the net soon.
Borini had a good loan spell on Wearside during the 2013-14 campaign, but he has failed to score in any of his three appearances since signing a permanent deal in the summer.
The 24-year-old's next chance to get off the mark comes this weekend, when Sunderland take on Manchester United in what looks a difficult match.