.Source: 49ers possess Aiyuk field platform with Browns, Patriots NBC Sports Bay AreaBrandon Aiyuk field requirement: 49ers WR more probable to become handled than obtain extension from San Francisco, per file CBS SportsReport: 49ers possess framework in location for Brandon Aiyuk trade with 2 crews San Francisco ChronicleReport: 49ers have worked out structures of Brandon Aiyuk trades with Browns, Patriots 49ers Webzone49ers insider offers most recent upgrade on Aiyuk as trade gossips swirl Yahoo Sports.