MMAWeekly.com reported the news on Wednesday morning.
Smith will drop to the welterweight division to face Daley. It will be his first bout since a loss to Cung Le in June. Smith had previously defeated Le with one of his trademark come-from-behind knockouts, but wasn’t able to overcome Le’s vicious body kicks during the rematch.
Daley was famously banished from the UFC after he struck Josh Koscheck after a loss to the new top welterweight contender in May. Since the loss, Daley defeated Daniel Acacio and Jorge Masvidal before signing a six-fight contract with Strikeforce.
The Dec. 4 Strikeforce event takes place in St. Louis and is headlined by a light heavyweight bout between Dan Henderson and Renato “Babalu” Sobral.