The phrase "calf problem" refers to a common issue where the muscles in the back of your lower leg, known as the calf muscles, can become tight or painful. Full definition
We lost Alex Oxlade - Chamberlain against Barcelona, then we got told there were setbacks to Cazorla and Wilshere, and now both Laurent Koscielny and Petr Cech have been ruled out of the Tottenham game this weekend with calf problems to mess up our defensive strengths. (justarsenal.com)
Pellegrini was coy on the injury status of captain Vincent Kompany after the PSG game, but the centre - back could return from his latest calf problem at Chelsea. (nigeriasoccernet.com)
I wanted to preserve some players, like Koscielny, who has a little calf problem. (justarsenal.com)