FILE - In this June 22, 2001, file photo, actor and former NFL player Merlin Olsen speaks in Urbandale, Iowa. The Hall of Fame defensive tackle went on to have a long career as the top analyst at NBC, working alongside greats like Curt Gowdy and Dick Enberg during the 1970s and 80s and calling five Super Bowls. A physical presence on the Rams "Fearsome Foursome" defensive line, Olsen was more soft spoken as an announcer. (AP Photo/Steve Pope, File)

FILE - In this July 24, 2000, file photo, Pat Summerall, lead play-by-play announcer for the NFL on Fox Sports, announces his retirement during a news conference in the Century City section of Los Angeles. Summerall transitioned from a successful playing career to the booth in the 1960s and became the voice of the NFL. He started off as an analyst and was part of the first Super Bowl. He shifted to a play-by-play role in 1974 at CBS and that is where he really shined. (AP Photo/Nick Ut, File)

FILE - In this Aug. 5, 2006, file photo, former Oakland Raiders coach John Madden gestures toward a bust of himself during his enshrinement into the Pro Football Hall of Fame in Canton, Ohio. After a decade run as a successful coach of the Raiders, Madden made his biggest impact on the game after moving to the broadcast booth at CBS in 1979. He became the network's lead analyst two years later and provided the sound track for NFL games for most of the next three decades, entertaining millions with his interjections of "Boom!" and "Doink!" throughout games, while educating them with his use of the telestrator and ability to describe what was happening in the trenches. (AP Photo/Mark Duncan, File)

FILE - In this Sept. 29, 2016, file photo, San Diego Padres broadcaster Dick Enberg waves to crowd at a retirement ceremony prior to the Padres' final home baseball game of the season, against the Los Angeles Dodgers in San Diego. Enberg replaced Curt Gowdy as the lead announce for NBC's coverage of the NFL in 1979 and spent more than three decades calling NFL games there and at CBS. Known for his exclamation "Oh my!" that was peppered throughout his broadcasts, Enberg called eight Super Bowls and NBC and was the pregame host for another. (AP Photo/Lenny Ignelzi, File)

FILE - In this Sept. 15, 2013, file photo, former New York Giants player Frank Gifford looks on before an NFL football game between the Giants and the Denver Broncos in East Rutherford, N.J. The Hall of Fame running back went on to have a career as one of the most versatile announcers in football history. (AP Photo/Bill Kostroun, File)

FILE- In this Jan. 27, 2017, file photo, NBC “Sunday Night Football” announcer Al Michaels arrives at the The NHL100 Gala held at the Microsoft Theater in Los Angeles. Michaels has been a prime-time fixture in the NFL for decades as the voice of "Monday Night Football" on ABC for 20 years and is now entering his 14th season calling Sunday night games on NBC. (Photo by Richard Shotwell/Invision/AP, File)

FILE - In this May 5, 1997, file photo, Jack Buck, announcer for the St. Louis Cardinals, poses in the KMOX broadcast booth at Busch Stadium, home of the Cardinals, in St. Louis. Best known for his work in baseball calling Cardinals games, Buck also had a big impact in football. He called the 1962 AFL title game that went double overtime and was one of the top announcers at CBS for more than a decade, calling the Ice Bowl and the Super Bowl in 1970. (AP Photo/Leon Algee, File)

FILE - In this Sept. 15, 1978, file photo, Curt Gowdy, the dean of network sportscasters, wears a headset. A versatile announce nicknamed the Cowboy who started off as Mel Allen's partner on Yankees radio broadcasts, Gowdy was one of the original voices of the AFL on ABC when the league started in 1960. He moved on to NBC in 1965 and was in the booth for some of the most memorable games in pro football history. (AP Photo/File)

FILE - In this Feb. 14, 1985, file photo, Howard Cosell speaks in his ABC-TV office in New York. One of a kind as an announcer, Cosell was the rare analyst who never played or coached the game. (AP Photo/Richard Drew, File)

FILE - In this Oct. 30, 2016, file photo, NBC Sunday Night Football cast member Cris Collinsworth sits on the set during pregame of an NFL football game between the Philadelphia Eagles and the Dallas Cowboys in Arlington, Texas. The former receiver moved right to TV after ending his career following the 1988 season working in the studio on HBO's "Inside the NFL." He did both studio work and worked as a game analyst throughout his career but has had his biggest impact on NBC's coverage on Sunday nights a decade ago. (AP Photo/Ron Jenkins, File)