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The Champions League draw took place on Monday, December 18 in Nyon, Switzerland.
Arsenal, who topped their group, have been draw against Porto, who finished second.
The first leg of round of 16 will take place on 13th/14th February or 20th/21st February at Estádio do Dragão.
While the second leg will take place at the Emirates on March 5th/6th or March 12th/13th.