The match review panel put no grading on the charge of dangerous contact with the head or neck on Sunday as it sent Soliola to a Tuesday evening judiciary hearing with no provision for an early plea.
Referees boss Tony Archer had already declared the Canberra forward should have been sent off for the ugly incident which forced Melbourne star Slater off GIO Stadium on a medicab on Saturday.
Beaten and losing touch with the top eight, Canberra's season of woe is set to get even worse with winger Jordan Rapana also facing suspension.
