Calvin Johnson, Chris Houston back in Detroit Lions practice

Calvin Johnson and Chris Houston have practised with the Detroit Lions for the first time this week.

The wide receiver and the cornerback were both limited in the team's Friday session, and are listed as questionable for their game against the Green Bay Packers tomorrow.

Johnson, who holds the league record for most receiving yards in a single season, has been struggling with a sore knee, while Houston has a hamstring injury.

The Lions currently sit at the top of the NFC North.