Multiple NBA teams are, as one source put it, "comfortable with the risks'' involving drafting Missouri forward Michael Porter Jr. despite his injury history, which this week caused the on-again postponement of a workout today in Chicago.

And yes, the Dallas Mavericks, I'm told, are among those "comfortable-with-the-risks'' teams.

Porter Jr. has been cleared for this second pro day after suffering hip spasms so severe on Thursday morning that he reportedly "could not get out of bed.'' An MRI was done and he's OK. But that doesn't mean the back surgery that essentially erased his entire college season isn't a lingering issue.

"We've interviewed him twice,'' Dallas GM Donnie Nelson told me this week. "We've met his family. We're close to people in his camp. We know him.''

But there is always more to know. So, I'm told, the Dallas traveling party is led today by team exec Michael Finley and the Mavs medical staff. (I believe the core purpose of today for Porter is all about medical evaluation.)

After last week's workout, the Mavs came away thinking of Porter Jr. as a top-three talent and "extremely impressive.'' There is a continuing idea that Porter Jr. -- as a shooter and a scorer -- can be Durant-like, or Dirk-like. And the Mavs crave that "transcendent'' prospect.

They are not alone, however. One source tells me the Chicago Bulls (at No. 7) would love to see Porter fall to them. And Sacramento (at 2) and Memphis (at 4) have him in play, too.

The level of the future problems with the back issue, though, is as difficult to fully calculate. Dallas will have fine info here; DFW-based Dr. Drew Dossett performed the surgery, and Mavs trainer Casey Smith is the best in the business. While Porter Jr. says there isn't a concern ... it's a back. That's tied to the hip. That prevented him from getting out of bed on Thursday morning.

It's a thing.

For Dallas, picking fifth in the June 21, the fall-out of all of this can be a win. If Chicago wants to move from 7 to 5, the Mavs will listen to trade talk. (Porter won't drop past 7, I'm told.) If Porter is gone earlier than 5, that means a player like Luka Doncic or Jaren Jackson Jr. will be nudged down toward Dallas.

And if Michael Porter Jr. is available at 5?

The Dallas Mavericks are "comfortable with the risks.''