The experienced duo have been close to returning in recent weeks, but have failed to prove their fitness on selection day.
Boak (ribs) has missed the last two weeks, while Dixon (quad) has been unavailable since Port Adelaide's Round 8 clash with Essendon.
Impressive winger Xavier Duursma has resumed running after a PCL injury sustained earlier in April, as Port Adelaide's injury list begins to shorten.
The Power, however, will be without developing midfielder Hugh Jackson (1-2 weeks) in the SANFL as he enters concussion protocol, while defender Tom Clurey (six weeks) continues his recovery from a back injury.
With three six-day breaks in a row, Port Adelaide will be carefully managing its tall timber. A foot injury has sidelined backup ruckman Brynn Teakle for up to 12 weeks, with Todd Marshall, Scott Lycett, and Dixon only just re-entering this performing side.
Selection will take place on Thursday evening before the Power take on the Western Bulldogs on Friday night at Marvel Stadium.