Detroit Lions quarterback Matthew Stafford left in the second quarter of a preseason game against the Oakland Raiders with an injury to his left, non-throwing hand.
The team said his return was questionable.
Stafford's hand appeared to get hit by an Oakland defender after throwing an incomplete pass Saturday. Trainers were examining Stafford's hand on the sideline. He was 8 for 10 for 68 yards.
Shaun Hill took over at quarterback on Detroit's next possession.
Detroit drafted Stafford No. 1 overall in 2009 out of Georgia. After a right shoulder injury in the 2010 season opener sidelined him for the year, Stafford threw for 5,038 yards and 41 touchdowns last season to lead the Lions to the playoffs, where they lost to New Orleans in the division round.
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