World number seven Elena Rybakina said she is "disappointed" at the WTA's decision to uphold the ban against her former coach Stefano Vukov following an independent investigation into his behaviour towards the player.
It was announced in January that the Croat had been provisionally suspended after allegedly breaching the WTA's Code of Conduct.
On Tuesday, the WTA - the governing body of women's tennis - confirmed Vukov's ban had been upheld.
"I'm just disappointed with the situation, and how the process went. I'm not going to comment much more," the 25-year-old said after her win over Rebecca Sramkova at the Qatar Open on Wednesday.