Alcatraz, a crime drama, reunites the Lost creator with Jorge Garcia, who played Hurley on the show.
Sam Neill, Jonny Coyne and Sarah Jones also signed up for a pilot episode which was filmed earlier this year.
The Finder is a spinoff of Bones, which was recommissioned for a seventh season earlier this month.
Geoff Stults will play protagonist Walter Sherman, a former military policeman. His character has already been introduced in the main series.
Michael Clarke Duncan and Saffron Burrows have also been cast as Sherman's sidekicks.
Speculation is also rife about drama cancellations at the network. The Chicago Code creator Shawn Ryan confirmed on Twitter that Fox has cancelled the police procedural drama. Additionally, Lie to Me and Human Target are also believed to have been axed by the network.
An eighth series of medical drama House was officially confirmed yesterday.
Fox is due to make a formal announcement about its schedule early next week.