Meredith Vieira  and Matt Lauer both have filled in for the ailing Bob Costas.

Vieira tells STF about subbing for Costas tonight

Bob Costas eye issues continue to keep him out of the anchor chair so Meredith Vieira, special correspondent for TODAY, will fill in for him as host of tonight’s NBC primetime and late night coverage of the 2014 Sochi Winter Olympics.