Waller (knee) was listed as limited again on Thursday's practice estimate, Rachel Gossen of the Raiders' official site reports.
Waller, who last suited up Week 12, now has been listed as limited in the Raiders' two walkthroughs this week due to a knee issue, so what he's able to do Friday should add a degree of clarity with regard to the tight end's chances of suiting up for Sunday night's 8:20 p.m. ET kickoff versus the Chargers.