Arsenal has signed French youth international Yaya Sanogo on a long-term contract after the striker's release by Auxerre.

Sanogo scored 11 goals in 24 appearances for Auxerre and has represented France in the under-16, under-17 and under-19 age groups.

He is currently playing for France in the Under-20 World Cup in Turkey, where he has scored in two of his team's three matches.

Arsenal manager Arsene Wenger says "Sanogo is a good young signing for us. ... We are looking forward to Yaya joining us and continuing his promising development."

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Hamburger SV has taken defender Johan Djourou from Arsenal on a one-season loan, with an option for a full contract after that.

The Bundesliga club says the Switzerland international passed a medical and signed the contract on Monday.

Djourou played for Hannover in the Bundesliga last season.