Nineteen-year-old Joe Willock scored twice, and Alex Iwobi added a third, as Arsenal cantered into the 4th round.
Ousmane Dembele and Lionel Messi both found the net for Barcelona who enjoyed a comfortable win at the Camp Nou.
ESPN FC's Shaka Hislop sifts through all the latest transfer rumours surrounding N'Golo Kante, Callum Wilson and many more in Transfer Rater.
Arsenal manager Unai Emery has not ruled out a January move for Barcelona winger Denis Suarez after revealing that he wants to sign a wide player and defender this month.
Suarez, who spent time at Manchester City as a youngster, is available for a fee in the region of £18 million this month after being told by Barca that he can leave the Camp Nou.
Emery is an admirer of the Spain international having worked with the 24-year-old during a loan spell at previous club Sevilla and, speaking after…