Vernon Philander will be heading to Somerset as a Kolpak player following the Test series against England, joining the growing list of Kolpak signings from South Africa.
The club has announced Philander will be playing for the English county after agreeing to "personal terms" with the cricketer.
"Somerset County Cricket Club are today able to officially confirm that we have agreed personal terms with Vernon Philander for him to become a Somerset player in 2020," Somerset said in a statement.
"It has been widely reported over the last few days that the South African would be joining the county, but the official paperwork required to complete the deal is being finalised with the ECB, with the club working towards the full procedure being completed successfully in the New Year."
The 34-year-old seamer had earlier declared that South Africa's home series against England will be his last assignment with the Proteas as he has decided to bow out of international cricket.
He snared four wickets in a brilliant spell of swing bowling during the first innings of the Centurion Test, which was eventually won by South Africa by 107 runs.
Philander, who previously represented Somerset in 2012, recently confirmed he will be returning to the club next year.
"Everyone knows that," he told reporters.
He denied signing a three-year contract with Somerset, contrary to the reports circulating in the media.
"We're going to go on a year-by-year basis and see how we go," he said.
His move to Taunton as a Kolpak player means he is eligible to turn out for the club without being considered as an overseas player.
A lot of county sides have made use of the Kolpak ruling with South Africa cricket bearing the brunt of the talent drain from its set-up.
Morne Morkel (Surrey), Kyle Abbott (Hampshire) and Duanne Olivier (Yorkshire) are some of the Proteas players who have cut short their time in the international cricket to sign a Kolpak deal and solidify their financial standing compared to the home country's low value rand currency.
However, Britain's imminent withdrawal from the European Union could have a drastic effect on these employment rulings - a development that South Africa skipper Faf du Plessis hopes would help his team.