Nacho Monreal has been displaced by Alexis Sanchez.
Alexis Sanchez was last night confirmed as an Arsenal player, much to the delight of millions of Gooners around the globe.
It signals an exciting era of change at the Emirates, turning the tables on Barcelona, signing an established superstar from them.
Arsene Wenger has used La Liga as a regular transfer shopping haunt in recent seasons, and for one of his relatively new signings, Alexis Sanchez's arrival has already made an impact.
Spanish defender Nacho Monreal, signed for £8.3 million in January 2012, has given up his squad number for Alexis - who now takes the number 17 shirt.
Monreal had a disappointing season in 2013/14, failing to make the Spain World Cup squad as a result despite being a regular in qualifiers.
He has not been displaced entirely however by Sanchez, taking the vacant number 18 instead.
The number 18 has a worrying recent history at the Emirates, with former players to wear the shirt being Pascal Cygan, Mikael Silvestre and Sebastien Squillaci.
Monreal will hope to buck that unlucky trend of players performing poorly in it, but will have to up his game from last season, when he was unable to knock Kieran Gibbs out of the side.
Gibbs meanwhile has been handed the number 3 shirt at the club for the new season, indicating his clear position as first choice left-back for the club.
Monreal's switch from Spain has been a tad underwhelming so far, although he is a very useful squad player, who the Gunners would be wise to hang on to bearing in mind Kieran Gibbs' history of injuries.