Arsenal boss Unai Emery has said his club’s chances of reaching the final of the Europa League are “50-50” – despite his side winning the first leg of their semi-final 3-1.
A late goal from Pierre-Emerick Aubameyang extended Arsenal's lead in against Valencia.
Alexandre Lacazette had scored twice in the first half after Valencia took an early lead through Mouctar Diakhaby.
"It will be very difficult over there," said Emery of next week's second leg in Spain. "The tie is 50-50."
He added: "I am very proud of our work. We know how tough Valencia will be in front of their fans next week."