England and Australia hit the nets ahead of the first Ashes Test of 2009 starting on Wednesday.
A game-wide anti-discrimination charter and code will be introduced.
Holder has led the West Indies for nearly five years.
Stokes will be skipper for the first Test against the West Indies, and Root took the time to write a short note to his stand-in.
A majority vote was reached at a meeting of first-class counties chairmen on Tuesday.
The Durham man tiptoed around ICC rules on overt political statements but made clear the occasion would not go unmarked by England.
Contests between the two sides have seen a number of record-breaking performances.
The former England spinner insists Test cricket can survive a summer without crowds.
The pair will go head to head this week when the first Test between England and West Indies gets under way in Southampton.
The first Test between England and the West Indies takes place on Wednesday at the Ageas Bowl.
Sibley made a strong impression during his first winter as an international cricketer.