John Elway's breaking his silence over the death of his longtime agent and best friend ... saying he's absolutely crushed over the tragedy.
“I am absolutely devastated and heartbroken by the passing of my close friend, business partner and agent Jeff Sperbeck. There are no words to truly express the profound sadness I feel with the sudden loss of someone who has meant so much to me," the 2x Super Bowl winner wrote.
Elway continued ... "My heart and deepest sympathies go out to Jeff’s wife, Cori; his children Carly, Sam and Jackson; and everyone who knew and loved him.