text: The 25-year-old has made three appearances since joining the German Bundesliga side on a three-year deal last summer.
  Greece international Petsos began his career at Bayer Leverkusen, and has had spells at Kaiserslautern, Greuther Furth and Rapid Vienna.
  He becomes Fulham's first signing of the January transfer window.
  Meanwhile, striker Stephen Humphrys has extended his contract at Craven Cottage until the summer of 2019, and joined League One side Shrewsbury on loan until the end of the campaign.
  The 19-year-old has featured three times for the Whites since making his senior debut in December.
  Find all the latest football transfers on our dedicated page or visit our Premier League tracker here.
target: Fulham have signed Werder Bremen midfielder Thanos Petsos on loan until the end of the season.