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Athletic Bilbao came from behind to secure their place in the group stage of the Champions League with a 3-1 victory over Napoli.
After a 1-1 draw in the first leg, Napoli nosed in front when Marek Hamsik opened the scoring two minutes after half-time, firing in a low left-footed shot which found the net off the inside of the post.
But Athletic responded with three quickfire goals after the hour mark.
Aritz Arduiz bagged two of them, afforded plenty of time before firing in Markel Susaeta's 61st minute cross and then capitalising on a defensive mistake to put the ball beyond Rafael Cabral in the 69th minute.
Five minutes later, Ibai Gomez drilled in a third to see off the Italians.
Celtic have completed the loan signing of Ghana winger Mubarak Wakaso.
The 24-year-old, who played in the World Cup, arrives on a one-year loan deal with Celtic having the option to buy the player from Russian side Rubin Kazan.
Celtic announced the former Espanyol and Villarreal player will go straight into their squad for Sunday's Scottish Premiership clash at Dundee.