.Source: 49ers possess Aiyuk profession structure with Browns, Patriots NBC Sports Bay AreaBrandon Aiyuk field demand: 49ers WR more probable to be worked than acquire extension from San Francisco, per record CBS SportsReport: 49ers have framework in position for Brandon Aiyuk trade with pair of teams San Francisco ChronicleReport: 49ers have actually worked out frameworks of Brandon Aiyuk trades with Browns, Patriots 49ers Webzone49ers expert gives latest update on Aiyuk as field reports swirl Yahoo Sports.