ALLEN PARK -- The Detroit Lions got some good news on Thursday as cornerback Chris Houston, defensive end Cliff Avril and safety Erik Coleman returned to practice.

Avril suffered a concussion against the Minnesota Vikings, but was medically cleared after Wednesday's practice. Houston had been sidelined since injuring his ankle in the contest. Coleman had been unintentionally poked in the eye and was sporting a visor on his helmet.

Still out for the Lions were defensive tackle Corey Williams and safeties Amari Spievey and Louis Delmas. Williams missed the game against Minnesota with a lingering knee injury. Delmas has been down since re-injuring his knee against the Seattle Seahawks in Week 8.

Spievey still hasn't been medically cleared to return after sustaining a concussion against the Chicago Bears in Week 7.

The team's full injury report is scheduled to come out at 4 p.m.