Perhaps his injury, and the fact he can't seem to recover from it, might be the reason he hasn't been dealt as of yet. It remains to be seen if he can pass a post-trade physical at this point.

Quote

In addition to Simmons the Sixers have another high-profile frontcourt player that has been significantly limited so far this preseason: second-year center Jahlil Okafor.

When training camp broke last week Okafor expected to be ready for the Sixers preseason opener, but soreness in his right knee has limited him in recent scrimmages and forced him to miss the Sixers’ first two preseason contests, and his 2016-17 debut doesn’t appear to be imminent.

“It has taken a while longer than we all, mostly Jahlil, had thought (it would),”head coach Brett Brown said about Okafor’s return to action. “But you’re just sort of very, very guided by the people that know more than all of us as it relates to his health.”

Okafor’s rookie season was ended prematurely when he had season-ending surgery to repair a torn meniscus in his right knee last March. At the time, the team announced that Okafor would be able to resume full basketball activities in approximately six weeks. That was thirty weeks ago.

“Because of the timing, it sounds probably more dramatic than it should that we’re not going to see him again. I get all that,” Brown said at the time. “The impact that it has on somebody moving forward is negligible.”

The Sixers maintain that Okafor’s knee is structurally sound and that they’re just being cautious

.


Read more at http://www.phillymag.com/news/2016/10/07/okafor-noel-injuries/#rI8Bt2JrJyiPseUZ.99

Okafor is working out and says he's ready to play.  Sixers could just be very cautions and there is no reason not to be with their glut of big men.  Embiid is looking good and Richaun Holmes seems much improved.  They may just end up trading both Noel and Okafor.