Parrilla, who was the chief executive officer of the Capsian-focused oil & gas services provider, remains with the company to assist in the transition on a consultancy basis.
Borko Moric will succeed Parilla as chief executive officer. Bojan Moric will become the company's chief operations officer.
"I am very pleased that Mr Borko Moric and Mr Bojan Moric have agreed to step into the CEO and COO positions,” Parilla said.
“Their expertise in oil and gas industry will enable a seamless transition. I look forward to the continued evolution of Chagala as they work to grow and better serve the company's clients and communities and develop new opportunities in Kazakhstan and elsewhere," he added.
Shares in Chagala were unchanged on Friday afternoon.