Both the team are clashing tomorrow at 3:30 PM IST in County Ground, Chelmsford.
Cook slammed an unbeaten 150 against The Cambs MCCU.
"As a former Essex player I know it’s a fantastic Club,"- Nel.
He will play eight matches of the season.
The 2019 T20 Blast will kick off on July 18 with Essex visiting Middlesex at Lord's.
“None of them have spoken to me since."
He will have to go through the grinds of domestic cricket now.
He wasn't considered in the Test team despite piling on the runs for Essex recently.
Both batsmen had impressive stints in English domestic cricket.
He accomplished his half-century in 78 deliveries.