After just three goals in 25 games this season, Millwall have chosen to release striker Scott McDonald, making the Australian a free agent.
The 31-year-old signed for the Lions from Middlesbrough in 2013 after seeing out his contract at the Riverside Stadium, and moved to The New Den on a free transfer.
McDonald has scored just six goals in 59 games for Millwall though, and with Iain Holloway's men struggling for form, he's decided to let McDonald leave and seek a new club.
"I'd like to thank everyone at Millwall and in particular the fans for all their suppor," said McDonald on the official Millwall website. "I had some memorable moments here, not least scoring the winner at Charlton last season, which was certainly a good feeling."
"I would like to wish the manager and the lads the very best for the rest of the season and I'll certainly be hoping they can move up the table and stay in the Championship," he added.
McDonald will now be on the lookout for a new employer during the transfer window, and may well find a suitor based on his incredible success at Celtic.
After moving from Motherwell to Celtic Park in 2007, McDonald hit 64 goals in 128 games - giving him a ratio of one goal every two games.
McDonald was a Celtic hero during his time with the club, and his absence was felt when he made a move to join his former boss Gordon Strachan at Middlesbrough in 2010.
A return to Celtic would be a huge surprise, but heading back to Motherwell wouldn't, with McDonald making his name at Fir Park before his move to Celtic.
At 31, McDonald still has something left in the tank, and may not be a free agent for long, with teams in Scotland, League One or even Australia bound to be interested in his services.