What position did this athlete play who played for the Dallas Cowboys between 1998 and 2001 and suffered a shoulder injury before the 1999 San Diego Chargers season?
1999 San Diego Chargers season:  Before the season, Ryan Leaf wound up suffering a shoulder injury during the Chargers' first training camp and was lost for the season. Ryan Leaf: Ryan David Leaf (born May 15, 1976) is a former American football player who was a quarterback in the National Football League (NFL) for four seasons. Ryan Leaf:  He played for the San Diego Chargers and the Dallas Cowboys between 1998 and 2001, and also spent time with the Tampa Bay Buccaneers and the Seattle Seahawks.
quarterback