For reference, opponent matchups go:
Citrus Bowl - vs Big 10 team
Pool of 6 Bowls (all same tier/level, SEC front offices in tandem with the schools and bowl games decide who goes where, with considerations like not sending teams to recent bowls they recently played in and traveling distances for fanbases)
+ Gator Bowl - vs ACC team
+ Reliaquest Bowl - vs Big Ten team
+ Duke's Mayo Bowl - vs ACC team // Las Vegas Bowl - vs former PAC-12 teams (should be the Mayo Bowl, since A&M went to the Vegas Bowl last year and the SEC and Big 10 switch off who sends teams to Las Vegas each year)
+ Music City Bowl - vs Big Ten team
+ Liberty Bowl - vs Big 12 team
+ Texas Bowl - vs Big 12 team
...if Tennessee absolutely falls off and finishes 6-6, they could end up in one of the following 2 remaining bowls:
+ Birmingham Bowl - vs American Athletic Conference team
+ Potentially the Gasparilla Bowl - vs ACC team / vs Big 12 / vs former Pac-12 team / vs American Athletic team / vs Conference-USA team / vs MAC team / vs Mountain West team (pretty much this game can feature teams from any of 8 conferences)