The HOME ALONE actor wanted to remain on the sidelines during the proceedings, but was compelled to come forward after prosecutor's cited him as an example of Jackson's alleged abuse.
He explains, "I didn't really want to (testify). I wasn't planning on getting involved in the whole thing.
"It was the prosecution who started bringing up my name and saying 'this person did that to me' and bringing in their witnesses.
"I'm not going to just sit on the side and let people say those kind of things about me.
"I had to testify really, they forced me into it."
Jackson was cleared of all charges against him.
Michael Jackson's private video collection of him and Macaulay Culkin, during the wrap party for Black and White, April 2003