Three points and goal difference that affect both clubs' final league positions and potential promotion or relegation outcomes.
A win can secure safety, a playoff place, or push a rival down the table depending on other results that same day.
Middlesbrough and Southampton squads, their managers, and key starters on matchday determine the outcome.
Referee crew, VAR officials, and substitutes also shape late-game swings through decisions and tactical changes.
Recent form, injuries, available starters, and tactical setups drive pre-match expectations.
Set-piece efficiency, defensive errors, VAR reviews, and late substitutions are common causal levers that change probabilities during the game.
Team sheets and confirmed starting XIs announced about an hour before kick-off will reveal tactical intent and fitness absences.
Watch early substitutions, halftime tactical shifts, set-piece counts, and concurrent results that can change how either side approaches the final minutes.