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 five-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.