Hudson, who sat out last week's loss to the Minnesota Vikings with an ankle injury, returned to practice this week and seemed to be making progress but coach Jack Del Rio didn't sound so optimistic when asked about Hudson's availability. Bergstrom made his first career start at center against the Vikings and drew praise from both Hudson and offensive coordinator Bill Musgrave. [...] Hudson is the anchor of the Raiders offensive line after signing a $44.5 million, five-year contract in March. A year after finishing with the NFL's least-efficient offense, the Raiders rank eighth overall and ninth in scoring heading into Sunday's game against the Lions. With the Raiders clinging to playoff hopes, Hudson is anxious to get back.