The Gunners want to sign a new central midfielder this summer as doubts remain over Jack Wilshereâ€™s future and Santi Cazorlaâ€™s fitness.
Arsenal have been linked with snapping up Max Mayer from Schalke on a free, but now they have set their sights on a bigger prize.
Indeed, according to AS, Arsene Wenger wants to sign Saul this summer after watching him in action.
The Spaniard has previously been linked with a big-money move to Manchester United after several eye-catching performances in La Liga.
The Gunners, who have never faced the Spaniards competitively, will meet Diego Simeone’s men for a chance to face either Marseille or Red Bull Salzburg in the final.