Waller (hamstring) returned practice Wednesday in a limited fashion, Rachel Gossen of the Raiders' official site reports.
Waller didn't practice last week before being ruled out ahead of this past Sunday's win over the Texans. The tight end's return to a limited session Wednesday bodes well for his chances of suiting up this weekend against the Saints, but he'll presumably need to log a full practice by the end of the week in order to avoid an injury designation.