It would help if we understood what the issue was. I'm still putting my faith in four things at the moment; he passed a medical very recently. That isn't a catch-all, but I think the club would have done a deep dive on him, and nothing is a complete surprise; he was genuinely extremely excited to join us. It would be kinda odd if he was not then doing all he could behind the scenes, and his ability is more than good enough to rotate into the side. There isn't any question marks about that. Additionally, Slot, and his team, are widely known for their conditioning and injury management, both on and off the pitch.