text: The 21-year-old has yet to make a first-team appearance for the Eagles, but has had six separate loan spells.
  In total, he has made 32 league appearances for clubs including Port Vale, Yeovil and Gillingham.
  The centre-back has also appeared for England at Under-21 level and joins a club which has won just one of their opening five League One games.
  Find all the latest football transfers on our dedicated page.
target: League One side Southend United have signed defender Ryan Inniss on a season-long loan from Crystal Palace.