The phrase "inevitable relegation" means that a team or organization is guaranteed to be moved down to a lower level or division. This implies that it is certain and unavoidable, usually due to poor performance or results. Full definition
It then takes them until about February until they decide to ditch their manager, if they haven't already, and bring in someone else to try and save the club from what looks like inevitable relegation. (eplindex.com)
It was a Boxing Day classic, if not in the defensive sense, for the Premier League, but a sign with how both teams know they have to be better to avoid a seemingly inevitable relegation fight. (bracethehammer.sbnation.com)
Elsewhere, we reckon Sunderland's inevitable relegation will finally be confirmed, with Hull City scrapping their way to a draw at unpredictable Southampton, as the Black Cats sink at home to care - free Bournemouth. (caughtoffside.com)