"I am grateful for his support, experience and everything we achieved together," Swiatek writes on Instagram.
Swiatek says the rest of her team remains unchanged.
"I know there are a lot of questions, but I will tell you what happens next at the right time," the star writes.
The 24-year-old, who has won six Grand Slam titles, was defeated by Magda Linette in Miami last week.
The loss ended her streak of 73 consecutive victories in first-round matches on the WTA Tour.
