.Resource: 49ers have Aiyuk field platform along with Browns, Patriots NBC Athletics Bay AreaBrandon Aiyuk trade demand: 49ers WR most likely to be worked than obtain extension from San Francisco, every record CBS SportsReport: 49ers have platform in position for Brandon Aiyuk trade with two groups San Francisco ChronicleReport: 49ers have exercised platforms of Brandon Aiyuk trades with Browns, Patriots 49ers Webzone49ers expert offers latest update on Aiyuk as profession rumors swirl Yahoo Athletics.