Novak Djokovic confirmed the partnership with Andy Murray as his coach will continue "indefinitely".

Three-time major winner Murray started working with his long-time playing rival on a trial basis at January's Australian Open, where Djokovic reached the semi-finals but was was forced to retire with a hamstring injury.

After his Melbourne exit, the 24-time Grand Slam champion said he and Murray would need to "cool off" before discussing the future.

However, speaking before his defeat by Matteo Berrettini in the first round of the Qatar Open, Djokovic confirmed Murray will return to his coaching team.

"I expressed my desire to continue the collaboration with him so I am really glad he did accept," Djokovic, 37, told the ATP Tour's in-house media channel, external.

"It's indefinite in terms of how long we are going to work together but we agreed we are going to work most likely in the [United] States and then some clay-court tournaments and see how it goes after that."

Murray, who retired in August last year, took a surprise coaching role with Djokovic's team in late November.