CENTURION, SOUTH AFRICA - JANUARY 23: Alastair Cook of England takes a break in his innings during day two of the 4th Test at Supersport Park on January 23, 2016 in Centurion, South Africa. (Photo by Julian Finney/Getty Images)
CENTURION, SOUTH AFRICA - JANUARY 23: Alastair Cook of England takes a break in his innings during day two of the 4th Test at Supersport Park on January 23, 2016 in Centurion, South Africa. (Photo by Julian Finney/Getty Images)