I'm actually not sure you can inject something which will allow a player to play with a hamstring or calf muscle tear, even a grade one tear. Is that even possible? You can block the pain receptors of course, but if a muscle is partially torn then it WILL completely tear if put under tension similar to anything like running at full speed. Firstly, I doubt even Alexis would go along with that and, secondly, there would be serious questions raised about a physician who would sign off on it.
