Middleton had surgery to repair a torn ligament in his wrist in early July. This injury dates back to March and is not the same injury that kept him out of the Bucks playoff run, which was an MCL sprain. (Tim Bontemps on Twitter )
Middleton is expected back by the beginning of the regular season. Hopefully he is able to heal fully and have some ramp up time before the season. If that’s the case, fantasy players shouldn’t expect a drop off in his production outside of the first couple of games.