The THRILLER singer has shown great interest in the faith since his sibling adopted it in 1989.
And now Jermaine is praying his brother uses his new-found spirituality to do good things.
He says, "When I came back from Mecca I got him (Michael) a lot of books and he asked me lots of things about my religion and I told him that it's peaceful and beautiful.
"He read everything and he was proud of me that I found something that would give me inner strength and peace.
"I think it is most probable that Michael will convert to Islam.
"He could do so much, just like I am trying to do. Michael and I and the word of God, we could do so much."
Source: WENN