BELGRADE, March 29 — Novak Djokovic said Thursday he was unsure who would be his new coach or even if there would be one, a day after ending a five-year association with Goran Ivanisevic.

Djokovic brought Croatia’s 2001 Wimbledon champion on board as a member of his team ahead of the grass court Grand Slam in 2019 and under his guidance won 12 of his 24 career major titles.