Andy Murray is finalising his preparations for the 2022 season and that has seen him split from long-term coach Jamie Delgado.
Delgado has been a member of Murray's team for five-and-a-half years, helping him to a second Wimbledon title and the world No. 1 spot in 2016.
He initially joined under Ivan Lendl but took over the main coaching duties in 2017. However, much of his time with the Scot has been spent rehabbing, with Murray's career derailed by hip injuries.
He has now left Murray's team to go and work with Canadian world No. 14 Denis Shapovalov.
Murray will continue a trial with German Jan De Witt at an exhibition event in Abu Dhabi next week as he prepares for next month's Australian Open.
The Scot, who was trialling with Johanna Konta's former coach Esteban Carril at a tournament in Stockholm last month, will play Dominic Thiem at the Mubadala World Tennis Championship, with a match against Rafael Nadal if he beats Thiem.
De Witt counts Gilles Simon, Gael Monfils, Tatsuma Ito, Nikoloz Basilashvili and Viktor Troicki as former players he has worked with.
He was behind Basilashvili's rise to a career-high 16th and has a reputation for his meticulous preparation and brutal honesty.
British No. 1 Emma Raducanu is also in action at the event in Abu Dhabi.