.Source: 49ers have Aiyuk trade framework along with Browns, Patriots NBC Athletics Bay AreaBrandon Aiyuk trade requirement: 49ers WR more probable to be worked than acquire extension from San Francisco, every document CBS SportsReport: 49ers possess platform in place for Brandon Aiyuk trade with 2 staffs San Francisco ChronicleReport: 49ers have actually exercised platforms of Brandon Aiyuk patronizes Browns, Patriots 49ers Webzone49ers expert gives most up-to-date update on Aiyuk as business stories swirl Yahoo Sports.