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SOCHI, Russia - NBC's Bob Costas plans to make his return on Monday after being off the air for a week with an eye infection.

The network said Sunday that Today host Matt Lauer will sub for Costas one last time on the Sunday night telecast, and that Costas is preparing for his return in prime time Monday.

The longtime Olympics host started duty in Sochi with one eye reddened from an infection that he hoped would clear up quickly. Instead, it spread to his other eye. It made his vision blurry and it was difficult for him to work, and his red eyes were a popular topic on social media.

Lauer and Meredith Vieira have filled in for him.

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