Hurting of the calf can result from either; however, I would like to consider the nail injury
as the more possible reason for the same. Your assessment about the depth of injury may not be correct (I mean there is always a room for an error in the assessment). However, if your assessment is correct, then football may be responsible for the present problem. In either case I would recommend rest for a week. Reassess the situation at the end of the week and then take further action. I don't think skinny trousers have any role to play in this matter.