Armstead is on the non-football illness list.
"Armond Armstead had surgery to treat an infection," the Patriots said in a statement. "Armond is in good condition and is expected to make a full recovery. A timetable has not been set for his return to football.”
Armstead had a heart attack at USC, but Patriots coach Bill Belichick indicated this is unrelated to that episode.
“I think it’s a different situation,” Belichick said.
Armstead, 22, was signed this winter following a stint with the Toronto Argonauts in the Canadian Football League.
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This story originally appeared on Nationalfootballpost.com
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