Former star Andy Whitfield was forced to depart the Starz drama in September to undergo treatment for Non-Hodgkin lymphoma.
TVLine now reports that The Pacific star McIntyre is considered to be the frontrunner to replace Whitfield, having undergone physical training to prepare for the role of Spartacus.
At the recent TCA press tour, Starz president Chris Albrecht told reporters: "We don't have casting news [yet] but are confident that we [will find an actor] who can ably step into Spartacus's sandals, although we will never be able to replace Andy Whitfield."
McIntyre was first rumoured to be under consideration for the part in November, alongside All My Children star Aiden Turner and Heartland actor Stephen Amell.
The next season of Spartacus: Blood and Sand is expected to air in late 2011. Prequel series Spartacus: Gods of the Arena will debut on Starz on January 21.