It's hard to believe it's been three years since the then-Oakland Raiders shook up the NFL with a late-summer trade that sent 2016 Defensive Player of the Year Khalil Mack to the Chicago Bears.
The Mack-powered Bears went on to win the NFC North that season, while the reloading Raiders went 4-12 in Jon Gruden's first season back on the sideline.
Preseason trades have become quite common, but that remains the most notable eleventh-hour blockbuster in recent years. Here are half a dozen potential summertime deals that aren't entirely unrealistic and could send shockwaves throughout the league.