[MI] Avoiding Worker's Comp Claim

One of our laborers said he hurt himself while performing a duty for work. He didn't tell anyone about it for four days, then he arrived at work with a back brace. He finally spoke of it. I call BS, but it's not my call. The owners are running scared, which, I suspect, the employee is banking on. The owners have decided to run interference. This man does nothing in sales at all, but they sent me an email saying they want to put him on desk duty, so we can still pay him, and he won't file the claim. They said that this is to make him uncomfortable enough (because it's outside his comfort zone) that he will want to return to his regular job, which is labor. Is this legal? Honestly, I don't like that he will be cold calling, because it can make our company look really bad if we start having people who don't know what they are talking about making these calls. But it's their company. I can walk away at any time. I advise, but they don't have to listen. They hired me to advise. TLDR: Is it legal to give someone a job duty that has nothing to do with their job, just to keep them from submitting a worker's comp claim weeks after the incident?