Freddie Prinze Jr.

Freddie Prinze Jr.

Freddie Prinze Jr. has been blasted by a former '24' star for calling Kiefer Sutherland "unprofessional."

Louis Lombardi, who co-starred on the series in 2005, has accused the 38-year-old actor of being "jealous" of the leading actor, 47, after Freddie recently claimed he almost quit acting completely because he "hated" working with Kiefer on the TV series in 2010.

The 46-year-old 'The Usual Suspects' actor said: "My experience with Kiefer was absolutely the opposite. He was one of the most professional actors I've ever worked with. He wanted the best out of everybody. I have nothing but great experiences with him. He's a gentleman."

He also told UsMagazine.com: "Maybe he [Freddie] was jealous, maybe Kiefer did something to him--who knows? But Kiefer's one of the most professional and most likable people! Kiefer is the most professional actor. I'm baffled about [that] kid's comments and baffled why he would say this years later! I'm all for Kiefer. I think he's a great dude and I have nothing but love for him. Everyone loves him, all the actors around him, the crew. Everyone!"

Kiefer previously insisted that he wished Freddie "the best" after his former co-star branded him "the most unprofessional dude."

A spokesperson for the star said: "Kiefer worked with Freddie Prinze Jr. more than five years ago, and this is the first he has heard of Freddie's grievances. Kiefer enjoyed working with Freddie and wishes him the best."