Saugus High’s Mike Dean and Lynn Tech’s Lorenzo Rivera are this week’s Item/Agganis Foundation high school football players of the week.The foundation will award weekly plaques, and will also hand out an offensive and defensive player of the year at the Item football dinner.Dean, a senior co-captain and running back, rushed for 126 yards and scored three touchdowns in the Sachems’ thrilling 35-32 victory over Newburyport.Rivera, a senior nose guard, came up big on several third down play in Saturday’s 28-6 victory over Dorchester.Both Saugus and Tech had promising seasons in 2007 and hope to build on them this fall.