National Assembly Speaker Baleka Mbete will pronounce on her decision over a secret ballot vote in the no confidence motion in President Jacob Zuma.
Mbete will address media at 3.30pm on Monday on the voting procedure to be followed when the motion is debated tomorrow.
Opposition parties have criticised Mbete for delaying her decision up to the last moment.
WATCH LIVE: Mbete to announce secret ballot decision
Leaders of opposition parties scheduled a meeting at 2pm to discuss a joint strategy ahead her verdict.
The EFF has threatened to go to court if Mbete's decision on the secret vote appears to be irrational.
At the same time, Parliament has refuted claims that there will be any extraordinary security measures on Tuesday.