Waller (knee) remained a spectator for Thursday's practice, Tashan Reed of The Athletic reports.
Now that he's missed the Raiders' first two Week 13 practices in addition to having interim head coach Rich Bisaccia label him as "week-to-week," Waller is trending toward missing his second game of the season Sunday against Washington. Assuming Waller continues to sit out practice Friday, he'll likely be officially ruled out in advance of the weekend, paving the way for Foster Moreau to fill in for him as the Raiders' starting tight end. When Waller was sidelined with an ankle injury in a Week 7 game against the Eagles, Moreau played 100 percent of the offensive snaps and reeled in six passes for 60 yards and a touchdown.