2017 marked the second and final year of the NFL's Thursday Night Football contract with CBS and NBC, as Fox would take over next season. Also, Amazon replaced Twitter as the digital rights holder. Also, along with the change in digital viewing, it was announced that there were 11 games simulcast between CBS, NBC, and NFL Network. While CBS kept the original 5 games, NBC simulcasted 6 games with NFL Network. Also, the change meant that CBS produced 4 NFL Network-only games, while NBC produced 3 NFL Network-only games, including a Week 15 Saturday doubleheader. In addition, after being banned from TNF for a year, and as backup play-by-play for NBC, Mike Tirico replaced Al Michaels full-time on Thursday night games. Tirico became the new studio host, replacing Bob Costas, who retired from many major jobs with the network, like the Olympics. He was also slated to be backup play-by-play announcer, replacing Michaels on various occasions. Michaels focused on Sunday night games, while Tirico handled Thursday nights with Cris Collinsworth or Kurt Warner.