.Source: 49ers possess Aiyuk field structure with Browns, Patriots NBC Athletics Bay AreaBrandon Aiyuk trade requirement: 49ers WR most likely to be handled than receive expansion coming from San Francisco, every record CBS SportsReport: 49ers have framework in location for Brandon Aiyuk trade with pair of staffs San Francisco ChronicleReport: 49ers have worked out frameworks of Brandon Aiyuk patronizes Browns, Patriots 49ers Webzone49ers insider gives most up-to-date improve on Aiyuk as field reports swirl Yahoo Athletics.