.Source: 49ers have Aiyuk field framework with Browns, Patriots NBC Athletics Bay AreaBrandon Aiyuk field requirement: 49ers WR most likely to be handled than obtain extension from San Francisco, per report CBS SportsReport: 49ers have platform in position for Brandon Aiyuk patronize pair of teams San Francisco ChronicleReport: 49ers have actually worked out platforms of Brandon Aiyuk trades with Browns, Patriots 49ers Webzone49ers expert provides newest update on Aiyuk as trade stories swirl Yahoo Sports.