Clearly, all four cannot play in the Tests and perhaps only two of them will make it at any one time if Rikki Clarke's increasingly sharp bowling continues to develop. "I think we may well have to rotate the bowlers from here on in, even during next week's one-dayers," said Fletcher. "Players get tired mentally as well as physically and that's when injuries seem to creep in. People in other sports, like rugby, say the same thing."