Diego Costa's first season at Chelsea was marked with lots of goals, a few suspensions, and constant injury concerns, largely about his hamstrings, but also his groin, his calves, and just about any and all muscles in his body. While his form dropped in the second season, so did his injuries. So far in his third season, he's been staying healthy and also scoring lots of goals — the best of both worlds — and he's even managed to yellow cards of late.
Clearly this trend is far too good to continue on indefinitely, but it sounds like both Chelsea and Spain are managing his condition very well.
Costa joined up with the Spanish national team at the start of this week (alongside fellow Chelsea player César Azpilicueta), but he was held out of Tuesday's training due to 'a small hematoma in the groin area'. Marca's report claims that this is purely a precautionary measure and that Costa is expected to be back in training today.
That said, since Spain face only lowly Macedonia on Saturday, perhaps Costa can sit out of that one, too?