QB Dalton impresses Bears with prized rookie Fields lurking Chicago Bears quarterback Justin Fields, right, works with running back Ryan Nall (35) during NFL football practice in Lake Forest, Ill., Saturday, July 31, 2021. (AP Photo/Nam Y. Huh) That's how strong an impression veteran Andy Dalton is making. "One hundred percent,” Nagy said. “He’s got full control of this offense. Without a doubt. We could play a game tomorrow and be just fine.” Of course, he'll take the time they have to smooth things out. The Bears still have a while to go before they stare down another team. They open the preseason Aug. 14 against Miami, and their first regular-season game is Sept. 12, when they visit the Los Angeles Rams.