Lock will start Sunday's preseason game against the Titans, Bob Condotta of The Seattle Times reports.
Sam Darnold won't play in Sunday's preseason game despite going through warmups in pads, paving the way for Lock to start for the second time in as many preseason games. Jalen Milroe is also expected to see action under center for the Seahawks on Sunday. Lock completed nine of 13 passes for 40 yards and a touchdown in the preseason opener against the Cowboys.