Before Greenlaw could sign on the dotted line, 49ers General Manager John Lynch and Head Coach Kyle Shanahan reportedly made a last-ditch effort to retain him as Fred Warner's run

“San Francisco, eventually, had outbid the Broncos, who’d honed in on Greenlaw to revamp the heart of their defense. But the 49ers’ brass only flew out — and their offer only increased — after the Broncos had already come after Greenlaw, sources said.”