The 20-year-old starlet was snapped up by the Red Devils in 2005 from Cologne, but has yet to make his debut for the club, featuring twice for Northampton Town during a brief spell at Sixfields last season.
Zieler has represented Germany at U16, U17, U18 and U19 level, winning 10 caps for the latter.
However, with Edwin van der Sar, Ben Foster and Tomasz Kuszczak all ahead of him in the Old Trafford pecking order, the youngster has admitted he needs to leave the club on loan again to help develop his game.
"I became absolutely delighted to be offered new terms this year as this was an indication the coaching staff is believing in the chance that I could make it at the club," he told Kicker.
"I had the desire to challenge for a first-team spot as soon as possible, but I am still lacking something to do so as Edwin van der Sar is a great shot-stopper and Ben Foster and Tomasz Kuszczak are experienced back-ups.
"I want to achieve the next step in my career and I have spoken to the manager about it.
"He really understands my point. I have always acted loyal to the club and I go on doing so.
"Anyway if possible I would like the chance to have a change of clubs this winter."
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