Arsenal's Declan Rice applauds after a English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Brentford's Michael Kayode, left, and Arsenal's Bukayo Saka battle for the ball during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Arsenal's Gabriel Martinelli, left, and Brentford's Michael Kayode battle for the ball during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Brentford's Yoane Wissa (11) celebrates after scoring his side's first goal against Arsenal during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Arsenal's Thomas Partey, second left, celebrates with teammates after scoring the opening goal against Brentford during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Arsenal's Thomas Partey celebrates after scoring the opening goal against Brentford during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Arsenal's Thomas Partey, right, scores the opening goal against Brentford during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Arsenal's Declan Rice, right, and Brentford's Christian Norgaard battle for the ball during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Arsenal's manager Mikel Arteta yells during the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.

Fans wave flags before the English Premier League soccer match between Arsenal and Brentford at Emirates Stadium in London.