.Source: 49ers possess Aiyuk business structure with Browns, Patriots NBC Sports Bay AreaBrandon Aiyuk field need: 49ers WR more probable to be handled than get expansion coming from San Francisco, per report CBS SportsReport: 49ers possess framework in location for Brandon Aiyuk trade with pair of staffs San Francisco ChronicleReport: 49ers have exercised structures of Brandon Aiyuk trades with Browns, Patriots 49ers Webzone49ers insider gives most recent update on Aiyuk as field rumors swirl Yahoo Sports.