Edelman rejoined the Patriots after visiting the San Francisco 49ers on Friday.
"Foxboro is home," Edelman later wrote on his Twitter account after word broke of his return. "Excited to be back. #grind"
Edelman declined a three-year contract offer from the Patriots prior to free agency.
Last season, Edelman emerged as a reliable threat with 105 catches for 1,056 yards and six touchdowns as he became Tom Brady's most consistent target.
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Aaron Wilson covers the Ravens for The Baltimore Sun