With Tannehill out, backup Matt Moore will start for the fourth week in a row.
The Dolphins apparently determined Tannehill isn't ready to return from a sprained left knee he suffered in Week 14.
Moore, a 10th-year pro, is 2-1 as Tannehill's replacement and will make his first career postseason start. Moore has eight touchdown passes, three interceptions and a quarterback rating of 105.6, which is higher than Tannehill's career-best 93.5 this year.
ESPN's James Walker and Adam Schefter and The Associated Press contributed to this report.