It's the second time in a week that Roberts has failed a physical to negate a transaction. Last week, the New England Patriots rescinded a trade with the Detroit Lions for Roberts after he failed a physical.
The Patriots were going to send a conditional seventh-round draft pick to the Lions in exchange for Roberts before the trade was nixed. The Lions then waived Roberts.
The 6-foot-5, 265-pound Roberts has played in 23 regular-season games over the past two years, totaling 13 catches for 146 yards and three touchdowns.