.Resource: 49ers have Aiyuk trade framework with Browns, Patriots NBC Athletics Bay AreaBrandon Aiyuk field requirement: 49ers WR more likely to be dealt than get extension coming from San Francisco, every record CBS SportsReport: 49ers possess platform in place for Brandon Aiyuk patronize pair of groups San Francisco ChronicleReport: 49ers have actually worked out frameworks of Brandon Aiyuk patronizes Browns, Patriots 49ers Webzone49ers insider offers most recent update on Aiyuk as field stories swirl Yahoo Sports.