Right back – Thomas Meunier?
If reports linking Hector Bellerin with a move to Barcelona are to be believed, Arsenal need to snap up an excellent replacement.
The Gunners are at risk of losing their first-choice right back to the Copa del Rey champions, but there are plenty of suitable replacements available on the open market - including Paris Saint-Germain full-back Thomas Meunier.
A decision on Bellerin's future isn't due until next week, but even if the 22-year-old Spaniard doesn't leave, Arsenal need someone of better quality than Mathieu Debuchy and Carl Jenkinson if they are to be competitive on more than one front next season.
Meunier is used to playing second fiddle, having made only 18 Ligue 1 starts last term for PSG, and with the Belgian entering his prime, at 25 years of age, he could be the sort of quality the north London club need.
For club and country, he racked up seven assists last term, he has pace and is vastly experienced already - Arsenal would be wise to pursue him.