Keith Olbermann will add a fifth voice to the studio on NBC's Sunday-night football highlights show in the fall, the network said on Monday.
Bob Costas anchors the show, with Cris Collingsworth and now Olbermann as co-hosts. With Jerome Bettis and Tiki Barber as analysts, the former NFL players will outnumber Costas and Olbermann by 3-to-2.
Olbermann, who first became known as a host on ESPN's "Sportscenter," has shuffled between news and sports during his career. His "Countdown" show on MSNBC has been hot lately, with Olbermann drawing attention for commentaries taking on the Bush administration.
He talks sports regularly each weekday afternoon on former ESPN partner Dan Patrick's radio show.
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Olbermann, who will keep his weekday work, said he expects the Sunday job to be rewarding and challenging.
"I hope I can hold up my end of the bargain," he said.