Van Heerden recently parted ways with the Buccaneers, and he returned to Durban to train with Usuthu a few days later and a source close to the club exclusively told Goal on Friday afternoon.
The Johannesburg-born defender has been handed a three-year deal as he will now work under coach Cavin Johnson next season.
"He has signed a three-year deal, but the deal will be announced on Monday or so," the source told Goal.
Fomerly on the books of Chippa United, the left back parted ways with the Soweto giants in the past few weeks and has returned to Usuthu.
Van Heerden joined the Buccaneers from the Chilli Boys in January last year, but failed to command a regular spot in the team under coach Milutin Sredojevic.
He battled for a spot in the starting line-up with the likes of Innocent Maela and Thabo Matlaba and was deemed surplus to requirements by the Serbian mentor.
Van Heerden will be expect to beef Usuthu's left flank whilst also helping in finding the back of the net with his accurate set pieces.
The Johannesburg-born left back could only make two starts in the Premier Soccer League (PSL) and one in the Telkom Knockout Cup for Pirates in the past season.
Meanwhile, the source also added that they will no longer pursue former Kaizer Chiefs defender, Sibusiso Khumalo and there is an Argentine striker who is expcetd in the country on Monday.