The Belarus midfielder joined Mathieu Flamini in leaving the Emirates Stadium after the end of last season, and although Wenger had initially been keen to retain his services he was content with the terms of a deal worth an initial £11.8million, rising to a possible £13.5million.
"We must firstly thank Alex for his contribution towards Arsenal during his time with us. He played a significant role in the three seasons he was with the club," said the Frenchman. "We are comfortable with our decision to let him go and we are all looking forward to continuing our preparations for the new season ahead."
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