Lions GM Martin Mayhew said Monday LCB Chris Houston is "still dealing with a medical issue" from last year, and may need surgery. Houston sat out pre-draft voluntary workouts with a toe injury. He's also battled leg, hamstring, foot, and shoulder problems in recent years. Per the website Over the Cap, the Lions would gain zero salary cap relief by cutting Houston. They'd actually absorb a $400K penalty. Houston's roster spot should be safe, but he's likely to face competition for his starting job in training camp.