Looking for some guidance.

Looking for some guidance.

I newly in my role in HR "a team of one" with a company of about 220 employees. An employee was out for about 2 months on STD/LOA and has since returned to work after back surgery. Per release from doctor he should work 8 hrs oppose to 10 per day and on light duty, no lifting, pulling or pushing anything over 10lbs. He's a driver and may have to occasionally lift, pull or push things that he picks up. Let me add we are an industrial contracting company. The thing is his "boss" is asking what if he has no light duty work for him. I personally feel as though the "boss" is purposely looking for something to say. But at any rate how do i proceed. Also, this is not going to be long term on light duty he just had back surgery 6 weeks ago.