The possibility of an all-English final in the Europa League grew likelier after Arsenal and Chelsea moved into strong positions in the semifinals on Thursday.
Arsenal will take a 3-1 lead into the second leg against Valencia after coming from behind through two goals by France striker Alexandre Lacazette and a 90th-minute volley from Pierre-Emerick Aubameyang at Emirates Stadium.
Chelsea also rallied to earn a 1-1 draw at Eintracht Frankfurt, with Pedro Rodriguez scoring the potentially crucial away goal in Germany.
Neither Arsenal nor Chelsea is guaranteed a top-four finish in the Premier League, which earns automatic qualification for next season’s Champions League. Winning the Europa League also offers that reward, which is why the teams have taken the competition seriously.
It had previously been