The sources cautioned that the social gaming company's plan has not been finalized and could change. They spoke on condition of anonymity because the plans are not public.
Zynga's debut is among a clutch of highly anticipated dotcom IPOs. Groupon launched its own roadshow this week and hopes to price its shares in early November.
Roadshows typically take two weeks. That means Zynga is looking to start its IPO marketing effort close on the heels of Groupon's market debut.
(Reporting by Clare Baldwin and Alistair Barr, editing by Bernard Orr)