Elina Svitolina's website announced that Justine Henin is joining the 21-year-old's team.
"The contract of the Belgian defines her as a special consultant," the website said. "Henin will accompany [Svitolina] in some of the tournaments with the first one taking part next week in Dubai."
The two worked together during the off-season, but had not decided at that point whether the arrangement would extend further. Svitolina has also trained at Henin's academy in Belgium.
The website said she was working towards a goal of being in the Top 10, having been as high as No. 15 in 2015.
Iain Hughes will stay on the team as her tour coach.