Top-level Knicks brass will head to Chicago on Friday to work out Missouri small forward Michael Porter Jr., according to an NBA source.

One year ago, the uber-athletic Porter was projected as the No. 1 pick of the 2018 draft, but he played in just three games for the Tigers last season after suffering a back injury in his collegiate debut. After undergoing surgery in November, it is unclear where Porter will be selected in the June 21 draft.

His medicals are deemed crucial in determining his stock, but he didn’t submit to any of those tests at the NBA Draft Combine in mid-May.

In an peculiar scenario, the Bulls’ medical staff reportedly is in possession of Porter’s medical records and is sharing them with certain clubs. Chicago selects seventh.

“[The surgery] was a step back to take three steps forward,” Porter said at the draft combine. “I took a step back, but now I’m able to reach my full potential being out of pain.”

The 6-foot-10 forward, an AAU teammate of former Oklahoma guard Trae Young, would fit perfectly on the Knicks’ roster. Despite the murkiness of his back issue, he still appears to be a long shot to fall to No. 9, according to sources.

The Knicks interviewed Porter at the combine and will do so again Friday. Porter said at the combine being drafted by the Knicks would be “awesome.’’

“I loved meeting with them, they knew everything about me,’’ Porter said. “It was cool meeting with those guys.”

Porter, who also hurt his back as a high school sophomore, proclaimed to still be the draft’s most talented player.

“They had me as the No. 1 player in high school, but I didn’t even feel I was 100 percent,’’ Porter said. “And I do now. So now I’m excited to show everybody the player that I am, that I’m still the best player. I got a little chip on my shoulder.’’

Porter staged a pro day in Chicago on Friday and The Post reported the Knicks had representation present. SNY reported scouts Walker Russell and Fred Cofield were in attendance. Porter is based in Chicago to be close to his agent, Mark Bartelstein.