The prevailing thought is that unless National Basketball Association team doctors get access to Porter directly, he may see his draft stock plummet.
Porter only played in three games for Missouri as a freshman last season because of back surgery.
Porter's camp appears to feel comfortable with his stock. The Chicago Bulls hold the seventh pick.
He's now listed as going fourth to the Grizzlies in Gary Parrish's latest mock draft. Even if he's received a promise from someone near the top of the draft, Porter will want to make it clear to the entire National Basketball Association that his health will not be an issue.
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Porter could potentially rise even higher than that if workouts go well.
Porter ceased all basketball activity after the season, focusing his efforts on rehab, sources told ESPN, after losing strength in his left leg in particular due to the injury.
The Mavericks have been conducting individual workouts for the past week and have visited several players for their private pro day workouts. His size, fluidity and shot-making ability off the dribble reminded teams of the player who had been highly touted before the season. Representatives of multiple teams that reviewed the information with their medical staffs say those results are encouraging.
A slew of other potential lottery picks, including Villanova's Mikal Bridges, Missouri's Michael Porter Jr., Michigan State's Miles Bridges, Alabama's Collin Sexton, Duke's Wendell Carter and Kentucky's Kevin Knox also secured invites. "But a conservative doctor could still [be concerned about] what might happen down the road".