The Bears could be shorthanded at the receiver position Sunday when they host the Detroit Lions in an NFC North clash at Soldier Field.
Equanimeous St. Brown has been ruled out of the game and is considered week-to-week with a pectoral injury he sustained this week while blocking in practice.
Asked about Jones, coach Matt Eberflus said: "We've got to really see where it is tomorrow because he's sick right now. I'll get more updates on that. I don't know the severity of that. We'll see where he goes and how it goes through today and then into tomorrow."
The only other Bears player with an injury designation for Sunday's game is defensive end Yannick Ngakoue, who is questionable with a knee issue. Ngakoue was a full participant in Friday's practice after being limited Thursday.
Cornerback Tyrique Stevenson (ankle), running back D'Onta Foreman (ankle) and offensive lineman Larry Borom (illness) all are expected to play after being full participants in practice throughout the week. Rookie linebacker Noah Sewell (knee) also appears to be good to go after practicing in full Thursday and Friday after being limited Wednesday.
For the Lions, center Frank Ragnow has been ruled out of Sunday's game with knee, back and toe injuries that prevented him from practicing this week.