Raiders head coach Bill Callahan and Williams did not go into the specific personal reasons for missing practice.
"Everything is good," Williams said. "I heard a lot of people blowing things out of proportion. I knew when I was coming back. I think it's pretty crucial but I felt it was something I had to do at that time."
Williams, who played mostly special teams last season, is competing for one of the backup spots behind probable starter Doug Jolley.
"I think anytime you miss reps, it's going to put you behind the eight-ball," Callahan said. "Those reps we took this past week were invaluable. We covered a lot of situational football. We covered a lot of areas at his position that we made dramatic changes in and that we continue to make changes in. I'm just pleased with Teyo Johnson's continued improvement. He's really shown the ability to be versatile and fit in."
Rod Woodson nursing sore knee
Free safety Rod Woodson missed Sunday's practice with a sore knee that he said he sustained while not practicing. Woodson, however, anticipates returning Monday.
"It's just precaution," Woodson said. "You can't go out there and be silly with an early injury. You've got to take it slow. We've been in camp a week. It was a fluke injury while I wasn't practicing. I'll be out there again tomorrow."
Rookie tight end Teyo Johnson has drawn a few comparisons to Kansas City tight end Tony Gonzalez because both starred in football and basketball. Johnson, however, showed that his dunking skills leave a bit to be desired. Johnson tried to dunk the ball over the crossbar but it clanked.
"We harped on him for his spike too," Callahan said. "His spikes have to get better too. The gang is on him for everything. I call him ‘Hard To.' Everything he wants, he wants to change the snap counts coming back from the blitz drill. I looked at him and said, ‘You can't be serious.'"
Wide receiver Jerry Porter, however, successfully dunked the ball moments later.
LB Travian Smith (ankle), LB Donny Green (calf), DT Junior Ioane (knee), WR Marcus Knight (hip) missed Sunday's practice. … CB Nnamdi Asomugha and CB Phillip Buchanon (hamstring) practiced in a limited capacity. … The Raiders will practice in pads Monday morning.
Vince D'Adamo can be reached at firstname.lastname@example.org