Essex have agreed a deal with Andre Nel to precede Danish Kaneria as their overseas player this year.
South Africa seamer Nel will start the season with the county, subject to the receipt of a work permit and formal permission from Cricket South Africa.
He will leave the club on May 18, three days before Pakistan leg-spinner Kaneria returns for his fourth spell.
Nel, who took 14 wickets in short stints with Essex in 2005 and 2007, said: "I am delighted to be returning to Essex for the beginning of the season.
"I enjoyed my time at the club in 2007 immensely and can't wait to rejoin the boys for the first game. I look forward to giving my all in an early season burst for the club."
First-team Coach Paul Grayson said: "Danish wanted a bit of time at home with his family, which means he misses the first month of the season, and we respect that.
"We've got a terrific replacement in Andre Nel, although we are unsure as to how long he will be available to us at the moment.
"This will be Andre's third spell with us and he's proved a very popular character in our dressing room, who is comfortable in our environment.
"Everyone at Essex is delighted he is coming back and we look forward to him making a positive impact while he is here."