LONDON, ENGLAND - FEBRUARY 27: Sean O'Brien of Millwall tackles with Dynel Simeu of Chelsea during the FA Youth Cup Sixth Round match between Chelsea FC and Millwall FC at Stamford Bridge on February 27, 2020 in London, England. (Photo by Jordan Mansfield/Getty Images)

LONDON, ENGLAND - FEBRUARY 27: Alex Mitchell of Millwall is tackled by Armando Broja of Chelsea during the FA Youth Cup Sixth Round match between Chelsea FC and Millwall FC at Stamford Bridge on February 27, 2020 in London, England. (Photo by Jordan Mansfield/Getty Images)

LONDON, ENGLAND - FEBRUARY 27: Alex Mitchell of Millwall is tackled by Armando Broja of Chelsea during the FA Youth Cup Sixth Round match between Chelsea FC and Millwall FC at Stamford Bridge on February 27, 2020 in London, England. (Photo by Jordan Mansfield/Getty Images)