I watched a video on youtube former Olympia bodybuilder was disscussing Goretzka's transformation said one thing that caught my attention there are some performance enhancing drugs which boosts Testosterone which do not show up on a drug test if you take a minor dose, from what he said you can dope in soccer he put it and your t leavels would be in the high high healthy range which is considered a pass. So an athlete could dope his levels to 900 odd which would mean hed put on more muscle mass and also injuries and burn out wouldnt occur across a season. so basically from what he said Goretzka could be dopping but it wont show up due to his test levels being in the healthy range. I find that super dodgy