LONDON, ENGLAND - FEBRUARY 04: The Arsenal medic confers with Petr Cech of Arsenal as Hector Bellerin of Arsenal is treated for an injury during the Premier League match between Chelsea and Arsenal at Stamford Bridge on February 4, 2017 in London, England. (Photo by Catherine Ivill - AMA/Getty Images)

LONDON, ENGLAND - FEBRUARY 04: The Arsenal medic confers with Petr Cech of Arsenal as Hector Bellerin of Arsenal is treated for an injury  during the Premier League match between Chelsea and Arsenal at Stamford Bridge on February 4, 2017 in London, England. (Photo by Catherine Ivill - AMA/Getty Images)