An NFL source confirmed Guion visited the Seattle Seahawks on Friday, three days after his criminal case in Florida was resolved following his February arrest on felony marijuana and firearm possession.
The source said the visit was set up almost immediately after Guion's plea arrangement was finalized on Tuesday, but added that Guion was "still very hopeful" a deal could be reached to return to the Packers.
Guion started every game for the Packers last season and posted career highs in tackles (62) and sacks (3.5) after he signed a one-year, $1 million contract last March.
The Packers also have yet to re-sign defensive tackle B.J. Raji.
Raji's season-ending biceps injury last August opened the door for Guion to be a starter. Guion signed with the Packers after he was cut by the Minnesota Vikings.
Packers coach Mike McCarthy has maintained throughout the offseason that he would like to have Guion back.
"I think to a man, everybody would like to see Letroy be a Green Bay Packer," McCarthy said earlier this week at the NFL annual meetings in Phoenix.