O'Connell and Gardner Minshew have been trading off first-team reps in training camp, Levi Edwards of the Raiders' official site and Tashan Reed of The Athletic report.
The fact that the two QBs have essentially been alternating first-team snaps on a practice-by-practice basis as the coaching staff gives both players a long look, though the starting experience O'Connell gained under Raiders head coach Antonio Pierce last season may give him a slight edge out of the gate. That said, if neither signal-caller pulls away during training camp and the preseason, it could be a while until a decision on the team's Week 1 starter is publicly revealed.