I think we're just being over-cautious about Costa's Hamstring injury. Grade 1 isn't too bad, 2-3 weeks and you are back to your full fitness in a week. Though yes, Hamstring injuries can happen repeatedly, a prime example is Sergio Aguero around the closing stages of the season. So I think there's just a little panic, and I don't blame anyone. He'll be a good signing for us.