The former House star will appear in three episodes of the CBS legal drama's third season.
However, King told TV Guide: "You know, we never let people go. We hang on to them like long-lost brothers, so if there's a chance we can get her for later in the year or even episodes after that, we would."
The executive producer also expressed his delight at The Good Wife's recent Emmy nominations.
"It's very exciting that the nominations acknowledge even more of the cast, because we just love them, so to have love come from outside the circle is a good thing too," he said.
King particularly praised series star Josh Charles, who plays law firm partner Will Gardner.
"We're thrilled, especially because I find [Will to be] a very difficult role that he does so well," said King. "[Will is] someone who's finagling and cutting ethical corners."
The Good Wife will return to CBS on Sunday, September 24 at 9/8c.
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Watch a clip from The Good Wife's second season finale below: