The San Francisco 49ers have negotiated the frameworks of trades which would send star wideout Brandon Aiyuk to the New England Patriots and the Cleveland Browns, according to Matt Maiocco of NBC Sports Bay Area. Aiyuk, who has been at a standstill in contract negotiations with the 49ers for months, now has the power to decide if he wants to accept the contract terms from either the Patriots or Browns. Both the packages will likely send a veteran receiver and a package of draft picks to San Francisco. Cleveland would be in position to acquire Aiyuk if Amari Cooper goes the other way to the 49e…