Lee Cox has signed a one-month loan deal at Huish Park.
The versatile defender could make an immediate debut in Saturday's game at Southend United.
"As I say week in, week out, every game in the league is a tough game and Saturday will be no different," Shrimpers boss Steve Tilson told BBC Radio Essex ahead of the game.
"But obviously being at home, even with the injuries we've got, this is one we'll still be looking to win."