- Field Yates, ESPN Insider
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Salas, who was inactive during Week 2, was acquired via trade from the Rams on Sept. 1. In exchange, the Patriots shipped St. Louis a seventh-round pick in 2015.
Rivera, 26, was signed to the Patriots' practice squad in November 2011 and found a spot on the 53-man roster this season. He has played a special teams role in each of the team's two regular-season contests.
The team added Hilliard leading up the regular-season opener and served in a situational fullback role. Hilliard played four of the team's 82 offensive snaps in Week 2.
In addition to the roster moves, the Patriots hosted seven players for a work out on Tuesday: defensive tackle Antonio Dixon, offensive tackle Tommie Draheim, defensive tackle Terrell McClain, offensive tackle Nick Mondek, wide receiver Kashif Moore, wide receiver Brian Robiskie and linebacker Nathan Stupar.
The Patriots have released wide receiver Greg Salas, linebacker Mike Rivera and fullback Lex Hilliard, according to a league source.Salas, who was inactive during Week 2, was acquired via trade from the Rams on Sept.