The South African still needs to pass a medical and sign the deal with Scotland's strongest club.
Here's how fans, Ajax and former coaches of Coetzee reacted to the move to Celtic.
Everyone is extremely proud to see one of our own take the next step in their football career.— Ajax Cape Town (@ajaxcapetown) August 21, 2017
Good Luck & make us proud Riva! pic.twitter.com/q4pN8zOkQO
From Kakamas to Glasgow. All the best RIVA. Still only 20 years old. pic.twitter.com/r7qluKyccl— Mazola J. Molefe (@superjourno) August 21, 2017
I see Rivaldo Coetzee's Wiki page has been recently updated. pic.twitter.com/HbTPu1swQ1— John Bradshaw (@JBLuvsCeltic) August 21, 2017
I really hope Rivaldo Coetzee's move to Celtic goes through. He is one of the best young players South Africa has produced in years.— Liam (@BekkerLiam) August 21, 2017