Nagy played coy about any details, saying he didn't know of the ESPN report from Adam Schefter. The Bears are still determining Trubisky's status ahead of their game against the Raiders in London on Sunday. Trubisky doesn't need surgery, ESPN reported, though Nagy wouldn't even acknowledge that much.
"We're still working through all of it," Nagy said.
Trubisky's injury occurred with 12:19 left in the first quarter against the Vikings on Sunday as he was sacked while scrambling to avoid pressure. He fumbled the football, but the play was nullified due to a defensive holding.
Trubisky walked with a Bears team trainer directly to the injury tent on the home sideline of Soldier Field. After an evaluation, he left for the locker room with team medical personnel. Trubisky returned to the sidelines later in the game with his left shoulder in a sling.
Backup quarterback Chase Daniel performed well in Trubisky's absence, completing 22 of 30 passes for 195 yards and a touchdown while not committing a turnover as Chicago earned a 16-6 win.
After facing the Raiders in London, the Bears have a bye week. Chicago then hosts New Orleans on Oct. 20.