Marc Goodfellow has joined Grimsby after being released by Swansea on transfer deadline day.
Marc Goodfellow joined Swansea from Bristol City in July 2005
The wing only joined the Swans last July, having impressed the previous season while on loan from Bristol City.
Goodfellow scored the Swans' first ever goal at the new Liberty Stadium, in the pre-season friendly against Fulham, but now joins Grimsby as a free agent.
"Marc's conducted himself very well and we all wish him well," Swans boss Kenny Jackett told the club's website.
"His contract was up at the end of the season and I felt it was best to tell him early that there wouldn't be a new offer coming his way."
Goodfellow joins the Mariners initially until the end of the season, with scope for a further extension.
Grimsby have also turned Gary Cohen's loan into a permanent deal after the 22-year-old Gretna striker agreed a contract running until the end of next season.