Now that the NFL season is officially over, we are fully in the offseason swing.While the NFL draft (which will be held May 8-10) will dominate the offseason chatter, we are just getting started. Teams are busy studying college prospects and it will ramp up during the NFL Combine later this month.Below is a look at the position where the San Francisco 49ers might look at early in the draft:ReceiversPotential top prospects: Sammy Watkins (Clemson), Mike Evans (Texas A&M), Marqise Lee (USC), Kelvin Benjamin (Florida State),Allen Robinson (Penn State),What to expect: This is the 49ers' biggest need.