Given the questionable health of safety Darren Sharper, the activation of Williams signals the Packers may have need for an extra running back Sunday night at Houston.
To activate Williams, the Packers released wide receiver/kick returner Kelvin Kight. Both players were waived during the Sept. 4 final roster cutdown.
Kight was signed to the practice squad three days later and was promoted to the active roster on Oct. 16. He did not catch a pass during the preseason — his drop of a deep pass in the preseason-finale at Tennessee may have cost him a job — but averaged 13.5 yards per punt return.
Williams was signed to the practice squad Sept. 15. He rushed 20 times for 62 yards in the preseason.
Davenport, Green Bay's bull of a backup running back, is listed as questionable for Sunday's game at Houston. He missed most of the second half against Minnesota after injuring his left hamstring.