Fenerbahce's overall performance was good. But Fenerbahce did not have a strong defense to resist Rangers' fast counterattacks. And that is why Fenerbahce lost this match. We saw Fenerbahce's dominance in Fenerbahce's home match. Fenerbahce players were able to make a lot of attacks. But even then Fenerbahce lost by 1-0. It is very unlikely that Fenerbahce will win by 3 goals in the second leg match. So Mourinho will have to give up the hope of the Europa League now. And he will have to focus more on the Super League.
You must be remembering incorrectly because Fenerbahçe lost 1-3 against Rangers, not 1-0. After this defeat, Fenerbahçe will need to beat Rangers by at least three goals in the next match to be played in Scotland, which is a very low probability. Because Rangers is a strong team with its fans in Scotland that can beat Fenerbahçe again. Jose Mourinho will now close the Europa League book. If he had not made the defensive mistakes in the first match, he might have gotten an advantageous score against Rangers, but the match cannot be turned again now.
This is my typing mistake. I remember that fenerbahce was losing 3-1. Because you will notice that in the next line I wrote that Fenerbahce need to win the away match by at least 3 goals to qualify for the quarter finals. And I don't think that is possible.
Rangers played well in the first match. They scored three goals, more importantly Rangers' defense is very strong. Despite Fenerbahce's players attacking a lot, Rangers' defense could not be broken. Rangers will naturally play defensively in the second leg. So it will not be possible for Fenerbahce to win by a big margin.