Career
He is currently with SV Straelen and has previously played for a number of clubs in Germany, England, Greece and Iceland. Niestroj began his professional career with Fortuna Düsseldorf, making his debut on 26 April 1997 in a 0–5 loss at Bayern Munich, the only Bundesliga appearance of his career. He broke into the team during the 1997-1998 season, scoring seven times, the best seasonal tally of his career.
After a bright start to the following campaign, he was spotted by English First Division side Wolverhampton Wanderers, who bought him in November 1998 for £500,000 as Colin Lee"s first signing.
He failed to make much impact though and managed just seven appearances in total (six of which came during the 1998-1999 season that saw the club miss out on the play-offs on the final day). Out of favour at Molineux, he spent the rest of his contract on loan at 1.
Football Club Nuremberg and Greek side Iraklis Salonica. He then rejoined his former club Fortuna Düsseldorf as a free agent in January 2002, where he remained for a season-and-a-half.
He had short stays at Football Club Sachsen Leipzig, Icelandic side Grindavik, Preußen Münster and Greeks Panserraikos.
He is currently playing for SV Straelen in the Verbandsliga Niederrhein (sixth tier).