Reports revealed that Raducanu wished to continue with Tursunov, but the Russian decided to leave to work with another player.
Raducanu has had no less than four coaches in the last 16 months.
The 19-year-old enjoyed some promising results under Tursunov, including reaching the semi-final of the Korea Open in Seoul last month.
However she has continued to suffer injury setbacks, retiring midway through her last-four clash with Jelena Ostapenko with a glute injury and withdrawing from last week's Transylvania Open with a wrist problem.
To that end, Raducanu is set to prioritise working with Andy Murray's former fitness coach Jez Green as she targets a return at the Billie Jean King Cup finals in Glasgow in December.