UPDATE: NBC ordering more 'Chuck'!

UPDATE: NBC is ordering six more episodes of "Chuck" from Warner Bros.

That's in addition to the 13 already ordered.

The network has not yet confirmed, but sources say this is a "done deal."

The original plan was for "Chuck" to return in March.

Now sources say "Chuck" will likely return in January and will be partnered with "Heroes" on Monday nights.

As part of this plan, NBC will not order any more episodes of "Trauma."

Nellie Andreeva contributed to this report