The American Idol judge worked in Houston's band years ago and was among the many stars who posted remembrances of Houston on Twitter hours after her death on February 11.
He wrote at the time: "Wow I am devastated. the world has lost another one of the best voices in history. RIP whitney houston, so fortunate am I to have worked with u, and have u touch my life. may god bless this family."
Jackson also discussed Houston's passing on The Ellen DeGeneres Show, declaring that the popstar has left behind an incredible legacy.
"We lost Etta James this year. When you lose one of the world's greatest ever… [between Whitney], Mariah [Carey] and Celine [Dion], I think they are the voices of this generation that you see now," Jackson told Ellen DeGeneres. "This is where all the Christinas and all these people came up on [as well as] Jennifer Hudson, who saluted [Whitney].
"Those three girls became the voice of the modern era. They sold more records than anyone. It's just sad."
Jackson's frequent collaborator Mariah Carey also honoured Houston this week by releasing a specially-created tribute video set to the 1998 hit 'When You Believe'.
Houston family friends the Winans have also spoken out about their promise to stand by Houston and Bobby Brown's daughter Bobbi Kristina Brown as she grieves.
"She'll make it through prayer and just surrounding herself with people who love her. She'll be just fine," BeBe Winans said this week.
Jackson's full interview on The Ellen DeGeneres shows airs Wednesday in the US.
The Ellen DeGeneres Show airs in the UK on Really weekdays at 4pm.
More Whitney Houston Coverage:
> Whitney Houston 1963-2012: Reactions
> Whitney Houston 1963-2012: Obituary
> Whitney Houston: A life in pictures
> Whitney Houston: Greatest musical achievements - pictures
> What is Whitney Houston's best song? Poll
> Clive Davis dedicates pre-Grammy party to Whitney Houston
> Whitney Houston to dominate singles, album charts next week
> Bobby Brown: "I love you, Whitney"
Watch Whitney Houston and Mariah Carey's 'When You Believe' music video below: