The duo will play members of Mike Baxter's family in an episode of the ABC comedy later this month, Entertainment Weekly reports.
Forster will star as the father of Mike (Tim Allen), while Rowe will star as Mike's brother.
Forster previously starred in Heroes and recently had a guest role in Alcatraz, while Rowe is probably best known for hosting Deadliest Catch.
The episode will also feature Malcolm in the Middle star Frankie Muniz as a bank loan officer.
Last month, ABC extended Last Man Standing's episode order, meaning that its first season will now consist of 24 instalments.
Kim Kardashian has also signed up for a guest role in Last Man Standing and will appear tomorrow night (February 7) when the show airs a double bill at 8/7c on ABC.