Stan Wawrinka has warned Andy Murray not to rush his return from hip surgery after the former world number one hinted he isn't certain to compete at Wimbledon.
Murray was beaten 2-6, 7-6 (7/4), 7-5 by Australia's Nick Kyrgios in the Queen's Club first round on Tuesday in his first competitive match for 11 months.
The 31-year-old Scot, whose ranking has plummeted to 156, admitted after the defeat he was unsure if his body could hold up to the demands of best-of-five-set ties at Wimbledon.
With Wimbledon starting on July 2, Murray doesn't have much time to regain full fitness.
And Swiss star Wawrinka, working his way back from a lengthy injury of his own, has told Murray just how difficult it is to play at a Grand Slam after so long on the sidelines.
"Well, my first match was at the Australian Open, and two days after I was not feeling pain or whatever, but my body was completely off. I felt dead," Wawrinka said.
"I lost in my next match, but I couldn't really do anything. That's mentally tough, because you have never experienced that in the past.
"So you need to learn from it, you need to adapt and accept it and be patient with yourself and what you're going to do."