The 2025-26 UEFA Champions League Round of 16 tie between Barcelona and Newcastle begins with a crucial first leg that could shape the entire matchup. The result of today’s game will not decide the series, but it can give one team a significant edge heading into the second leg.
In the UEFA Champions League knockout stage, teams advance based on the aggregate score across both legs, meaning goals from the first match carry directly into the return fixture.
That makes every possible result important in the opening clash. Whether Barcelona win, draw or lose, the outcome will shape the tactics and expectations for the decisive second leg as both clubs chase a place in the quarterfinals.
What happens if Barcelona beat Newcastle?
If Barcelona beat Newcastle in the first leg, they would take an advantage into the second leg of the Round of 16. A win would give the Spanish side a lead on aggregate before the return match at home, putting it in a strong position to qualify for the quarterfinals of the UEFA Champions League.
Because the knockout rounds are played over two legs, what matters most is the total number of goals scored across both matches (aggregate score). If Barcelona win the first leg, they would only need to protect or extend that lead in the second leg to advance.
For example, if Barça win by one or two goals, Newcastle would be forced to overturn that deficit in the return game. The English side would need to win the second leg by enough goals to either equalize or surpass Barcelona’s aggregate total.
What happens if Barcelona and Newcastle tie?
If Barcelona and Newcastle draw the first leg, the tie would remain completely open going into the second leg. Neither team would have an advantage on aggregate, meaning the return match would essentially decide everything.
In this scenario, whichever club wins the second leg would automatically advance to the quarterfinals. If the second game also ends in a draw and the aggregate score remains level, the match would move to extra time and potentially penalties to determine the winner.
The away-goals rule is no longer used in the UEFA Champions League, meaning goals scored away from home do not carry extra value. Because of that change, a draw in the first leg simply sets up a winner-take-all second leg, with both teams starting on equal footing.
What happens if Barcelona lose to Newcastle today?
If Barcelona lose the first leg, Newcastle would take the advantage heading into the second leg of the Round of 16. The English club would lead the aggregate score, meaning Barcelona would need to overturn that deficit in the return match.
The size of the defeat would matter. If Barcelona lose by one goal, they could still level the tie with a one-goal win in the second leg. If they lose by two or more goals, they would need an even bigger victory at home to stay in the competition.
However, even in that situation the tie would not be decided yet. Because the knockout stage is played over two matches totaling 180 minutes, Barcelona would still have a full second leg to try to reverse the result.
If they manage to equalize the aggregate score after the second game, the matchup would go to extra time and potentially penalties to decide who advances.
