Duren and the Pistons have seemingly not made any progress on a long-term extension, with Tim MacMahon of ESPN reporting that negotiations have been "nasty."
Essengue enters his second NBA season after spending much of his rookie year recovering from shoulder surgery.
Okoro remains primarily a defense-first wing heading into his second season with Chicago.
Okorie posted 27 points (8-19 FG, 1-5 3Pt, 5-5 FT), four rebounds, three assists and one steal over 28 minutes during the Pistons' 101-87 Summer League loss to the Heat on Friday.
Williams finished Friday's 101-87 Summer League loss to Miami with 15 points (5-8 FG, 1-4 3Pt, 2-2 FT), five rebounds, one assist and one steal over 25 minutes.
Sellers accumulated 17 points (6-12 FG, 3-8 3Pt, 1-1 FT), two rebounds, one assist and two steals over 26 minutes during Friday's 100-91 Las Vegas Summer League loss to the Cavs.
Atwell logged 22 points (8-10 FG, 6-7 3Pt), two rebounds, one assist and two blocks over 27 minutes during Friday's 100-91 Summer League loss to the Cavaliers.
Wilson (rest) is out for Friday's Las Vegas Summer League finale versus the Cavs, K.C. Johnson of Chicago Sports Network reports.
Swain is out for Friday's Summer League game against the Cavaliers due to right wrist soreness, per K.C. Johnson of Chicago Sports Network.
Essengue (thumb) won't play in Friday's Summer League game against the Cavaliers, K.C. Johnson of Chicago Sports Network reports.
