There is no such criteria. Why do you guys keep this myth going?? It all should have died forever with Daunte Culpepper. You can void a trade if a team tried to send you a player without disclosing the injury, but you can trade for a dead guy if know it ahead of time and you still want to make the deal.
You guys? What myth? I didn't say you couldn't do it. I asked "who in their right mind is making the trade?"
Nobody needs to disclose anything because EVERYONE already knows Tannehill is coming back from surgery.
No GM is trading a high pick (or any pick) for a player coming off injury WITHOUT a physical.