The ICC Test Championship starts right after the World Cup in England.
Rahane the vice-captain of the Indian Test team isn't a part of the World Cup 2019 squad.
Cook slammed an unbeaten 150 against The Cambs MCCU.
He will play two first-class games along with six One-Day matches for Nottinghamshire.
Viljoen is eligible to play for the Proteas again.
The in-form batsman is looking forward to developing his game to play white-ball cricket.
Bavuma will play eight county matches for the Northants and the club is excited over his arrival.
He will have to go through the grinds of domestic cricket now.
The fast bowler seemed to be excited to represent his new team.
The 33-year-old was also a part of their County Championship winning campaign last year.