Overview
- Coach Kyle Shanahan confirms no progress in Aiyuk's contract negotiations with the 49ers.
- Aiyuk must choose between trade offers from the Cleveland Browns and New England Patriots.
- The 49ers have agreed to trade proposals involving Amari Cooper and Kendrick Bourne.
- Aiyuk's potential new contract could be worth up to $30 million annually.
- Injuries to key players complicate the 49ers' preseason preparations.