Al Michaels gives gravitas to Amazon Prime Video’s new exclusive Thursday Night Football, which was on full display during last week’s preseason opener.

But he almost wasn’t a Prime member.

During the frenzied game of musical chairs around the top NFL broadcast booths this offseason, Michaels told The Post, he “probably” would have ended up at ESPN with Troy Aikman if Joe Buck had not landed there.

When Buck quickly reunited with Aikman for Monday Night Football, the Fox Sports lead job opened — with the enticing prospect of calling two of the next three Super Bowls.