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Cesc Fabregas gave verbal consent to the club after London strategist Arsene Wenger assured him that he would not stand in his way.
However, the Spanish champions still need to agree on what compensation "Arsenal" will receive.
According to "Marca", the Catalans are currently prepared to pay 30 million euros for security and give up Thiago and forward Bojan Krkic.
If the deal were to go through, Wenger would like Spanish to be replaced by Scott Parker in the London team. He currently belongs to London's "West Ham" club, which has relegated to the second division in terms of strength.