Andy Murray's new coach Jonas Bjorkman will spend the whole of the summer with the British number one.
The Swede will be with Murray's team through Wimbledon and until at least the end of the US Open in September as main coach Amelie Mauresmo prepares to have her first child in August.
Former world number four Bjorkman, 43, links up with Murray, 27, for the first time at this week's BMW Open in Munich.
The arrangement was initially a two-week trial.
"After Wimbledon, providing everything is good, I'm going to spend the whole of the hard-court stretch through to the end of the US Open with Jonas," said Murray.
"Then I'll see what happens with Amelie because I don't think she knows what her priorities are going to be and how she wants to deal with things so we'll just see for a few months."
French Fed Cup captain Mauresmo has led Murray's coaching team since her appointment last June and works with the Scot for 25 weeks a year.
Under previous coach Ivan Lendl, Murray won his first Grand Slam at the 2012 US Open, Olympic gold and the 2013 Wimbledon title.
|BBC tennis correspondent Russell Fuller|
|"Bjorkman's final commitments with Swedish TV's version of Strictly allowed him only limited training time with Murray in Barcelona last week, but they will get more time together in Munich as the world number three gets his clay court season underway. I'm told there is "no reason" why the arrangement shouldn't become more permanent, and it is possible that both Bjorkman and Mauresmo will be on duty at next month's French Open. Mauresmo's long term future has to remain in doubt - simply because it's very hard for her to know if she will be able to commit to 25 weeks a year on tour once she becomes a mother."|