Siemian is slated to start Friday's preseason game against the Falcons, Geoff Hobson of the Bengals' official site reports.
The report notes that after Siemian gets first-half work in on Friday, Jake Browning is in line to play the second half of the contest. Meanwhile, starter Joe Burrow didn't make the trip with the team to Atlanta as he continues to rehab his strained calf.