A former sought-after free agent who signed with the team in March 2014, Roberts has missed the past three games with this knee injury and saw his role reduced prior to going down.
Roberts will undergo surgery to repair this issue, which flared up in practice last week.
The 27-year-old target’s mired through his worst season as a pro, catching only 11 passes (Roberts’ previous career low was 24 as a Cardinals rookie in 2010) and playing behind Pierre Garcon, DeSean Jackson and rookie Jamison Crowder.
Keim suggests Roberts, who signed a four-year contract worth $16MM last year, could wind up as a post-June 1 cut in the offseason. He occupies cap numbers of $5MM apiece in 2016 and ’17 and would cost Washington just $1MM in dead money if released after June 1.