Mayhew said Thursday the team received good reports from Stafford's showing at a charity event that was part of Georgia's spring game last week. Stafford threw passes through a tire in a competition against other former Bulldogs and had a 50-yard pass dropped by a fan.
The Lions can receive reports on Stafford's progress, but aren't permitted to make contact with him during the lockout.
Stafford played in just three games last season and 10 games as a rookie the previous year. He is 3-9 in the NFL and his .250 winning percentage ranks as the worst among quarterbacks drafted No. 1 overall.