Karleigh Osborne has signed a two-year contract with Championship club Millwall after impressing during a recent trial.
The 24-year-old defender left Brentford earlier this summer after his contract expired, but he sufficiently impressed during training to gain a new deal.
Osborne came through the youth ranks at Griffin Park, paying 185 times after making his debut in 2005.
Millwall finished 16th in the Championship last season.