.Resource: 49ers have Aiyuk field structure along with Browns, Patriots NBC Sports Bay AreaBrandon Aiyuk profession requirement: 49ers WR most likely to be dealt than acquire extension from San Francisco, per document CBS SportsReport: 49ers possess framework in position for Brandon Aiyuk trade with two staffs San Francisco ChronicleReport: 49ers have exercised frameworks of Brandon Aiyuk trades with Browns, Patriots 49ers Webzone49ers expert gives most recent upgrade on Aiyuk as profession rumors swirl Yahoo Sports.