"They're still evaluating if he needs surgery," Fox said. "It is the same basic injury [he's suffered before]. They don't know the exact extent, but it is re-broken and they're still evaluating."
Wilson, who broke the foot at practice, will probably land on injured reserve before the Bears play the Green Bay Packers on Sunday. The Bears have a roster exemption until Saturday for recently reinstated wide receiver Alshon Jeffery, who can take Wilson's spot on the 53-man roster.
A 2013 seventh-round pick, Wilson fractured his left foot during mandatory minicamp in June and underwent surgery. He spent nine weeks on the physically unable to perform list before the Bears activated him Nov. 20 against the New York Giants.
Wilson caught eight passes for 125 yards and one touchdown the next week vs. Tennessee but dropped a perfectly thrown ball in the end zone. The 6-foot-4 wideout played sparingly against San Francisco because of a pulled groin muscle and was inactive last week for the loss to Detroit.
He broke the same foot in 2015 and landed on injured reserve for the final five games of that season. Wilson sat out the first nine games of 2014 after he broke his clavicle diving for a deep ball at training camp.
Since 2013, Wilson has appeared in 31 regular-season games, catching 56 passes for 777 yards and three touchdowns.
Wilson's original rookie contract expires after the season.