The trio of Michaels, Dan Dierdorf (who joined "MNF" the year after Michaels's first), and Frank Gifford lasted until the 1997 season when Gifford was replaced following disclosure of an extramarital affair. During the 1980s, Gifford would fill-in for Michaels on play-by-play whenever he went on baseball assignments for the League Championship Series (1986 and 1988) or World Series (1987 and 1989).