SOUTHAMPTON, ENGLAND - JANUARY 28: Theo Walcott of Arsenal celebrates with team mates after scoring his sides fourth goal during the Emirates FA Cup Fourth Round match between Southampton and Arsenal at St Mary's Stadium on January 28, 2017 in Southampton, England. (Photo by Bryn Lennon/Getty Images)

SOUTHAMPTON, ENGLAND - JANUARY 28:  Theo Walcott of Arsenal celebrates with team mates after scoring his sides fourth goal during the Emirates FA Cup Fourth Round match between Southampton and Arsenal at St Mary's Stadium on January 28, 2017 in Southampton, England.  (Photo by Bryn Lennon/Getty Images)