“I leave now to go away next week to Madrid. It’s pretty much full on through until the Olympics for the next few months.“(It is) a number of surface changes in a very short space of time, so you never know how the body is going to react or how it’s going to pull up after those changes.“I’ll just have to see how my body is. Hopefully I’ll be fine, but it’s going to be a tough few months and I think all the players are aware of that right now. The more surface changes that are put in there makes it that bit more tricky.” Andy Murray could potentially miss Great Britain’s Davis Cup match with Serbia over concerns about the playing surface.The tie is to be played on clay and while Murray was the inspirational figure behind Great Britain’s first Davis Cup success in 79 years, he may sit out the next step on the road to retaining the trophy, explaining changing surface often may hamper his chances in other tournaments.Murray has a packed schedule with the French Open, Wimbledon and US Open, as well as the Olympics in Rio. The 28-year-old will be deep into preparation for Wimbledon by the time of the Serbia tie and would have to switch from clay to grass and then hard court for the US Open in quick succession.Asked if that would alter his previous desire to compete in Serbia, he said: “Potentially. I need to see how my body is first.