The former Stuttgart defender spent parts of this week at Portman Road and played in the match against Rangers and impressed, however Town boss Joe Royle did not think the 27 year old would make a positive contribution to the squad, and declined to make an offer for the player full time.
Speaking of the chance of joining Leeds United, Marques told their Official Club Website: "Leeds is a big club, it's really a Premier League club and I believe that Leeds will be in the Premiership again.
"I had some difficult times after Germany, but I think England will be a new start for me. I think it will be very interesting for me to play in England and I believe I have a lot to offer."