The actor recently revealed more details about the role in an interview with Empire, where he describes Harold Attinger as "malevolent."
"He's a no-nonsense guy. He's lived his life in the shadows for 30 years in the service of his country, and he likes to be unremarkable yet very efficient."
When asked about working with director Michael Bay, the actor had this to say.
"I don't know if Michael has seen Frasier. He's been very respectful and funny. He's a terrific guy and quite a filmmaker. He just said to me the other day, 'You're Kelsey Grammer - you can do whatever you want to do.' So I guess he at least has some acquaintance with my work."
Transformers: Age of Extinction is currently shooting in Chicago, with a June 27, 2014 release date set by Paramount Pictures.
Transformers: Age of Extinction was released June 27th, 2014 and stars Nicola Peltz, Mark Wahlberg, John Goodman, T.J. Miller, Stanley Tucci, Kelsey Grammer, Sophia Myles, Jack Reynor. The film is directed by Michael Bay.