Arsenal have been looking at bringing in an attacker for most of the summer transfer window. Nico Williams was identified as a prime target by Mikel Arteta but it looks as though he’s set to stay at Athletic Bilbao. Bayern Munich’s Leroy Sane is also being considered at Arsenal and that deal could still happen before the transfer window slams shut on August 30th. Though, one target who they held talks to sign is now set to join Barcelona. READ MORE: £51m attacker who Arsenal want to sign is expected to snub move to the EmiratesBarcelona set to sign Federico Chiesa Arsenal have been in talks to…