The 28-year-old joined from Borussia Dortmund on a long-term contract for a club-record fee.
This is Arsenal’s second signing of the January transfer window. Auba is one of the world’s most highly-rated strikers. He scored 98 goals in 144 Bundesliga games for Dortmund and had a hand in 172 goals in 213 matches in all competitions for his former club.
That works out at an average of 96 minutes per goal or assist.
This deal is subject to the completion of regulatory processes and Auba’s squad number will be confirmed shortly.