The Detroit Lions have begun to receive calls from teams interested in trading for Matthew Stafford to gauge their asking price.

The Lions are believe do to be asking for "fair market value" for Stafford.

The Staffords have also been making preparations to leave. They put their suburban Detroit mansion on the market -- listing price $6.5 million -- this week. They initially put the house on the market in May, but pulled it off the market when the season started in September.