The Buccaneers are expected to make attempts to bring in the three midfielders as coach Kjell Jonevret revamps the Pirates squad.
The Swedish tactician prefers using box-to-box midfielder Oupa Manyisa, 28, as an attacking midfielder, which leaves Issa Sarr, 30, as his only holding midfielder in the team.
Bucs utility player Abbubaker Mobara, 23, has flourished as a midfielder in recent times, but Jonevret needs more options in the central midfield.
Shongwe, 27, and Motshwari, 26, have been linked with the Houghton-based club since last year, with the former battling for regular game-time.
But Pirates are believed to be facing stiff competition from their rivals Mamelodi Sundowns and Kaizer Chiefs for Shongwe's services.
Ntshangase's name has reportedly cropped up in conversations at Pirates as they prepare for the 2017/18 campaign.
However, the Buccaneers will have to make an enticing offer for the former South Africa Under-23 international, who is still tied to a long term deal at Wits.