According to several reports, Watkins will leave the Rams this week as a free agent and sign a three-year contract with Kansas City worth $48 million (with $30 million of that guaranteed).
Since he came into the National Football League in 2014, Watkins is fourth in yards per reception (15.9) among players with 100 or more catches in that span.
The wide receiver reeled in just 39 catches for 593 yards a year ago in Los Angeles, but still managed to be a threat in the red zone with eight touchdowns. He had his best statistical season in 2015 when he caught 60 passes for 1,047 yards and nine touchdowns.
The Rams acquired Watkins early last August, sending cornerback E.J. Gaines and 2018 second-round pick to the Bills.
The Rams had considered using the franchise tag on Watkins, but opted instead to tag safety Lamarcus Joyner.
Watkins will join Tyreek Hill and tight end Travis Kelce in a new-look offense that will feature quarterback Patrick Mahomes, who takes over for the departed Alex Smith.
However, it seems the Colts were looking to add the 24-year-old playmaker and were reportedly "in the final mix" for Watkins, per ESPN's Dianna Russini, before he chose the Kansas City Chiefs. Watkins hasn't played a full season since his rookie year.
The Rams could look to the free-agent market or the draft for a Watkins replacement, given that they have nearly $40 million in salary-cap room this offseason, but there are other needs.