South African fast bowler Marchant de Lange will replace Wahab Riaz for the opening stages of the Trent Rockets' campaign of The Hundred.
The 30-year-old has impressed in the Vitality Blast this summer for Somerset, taking 13 wickets at an average of 19.53.
In total, the 6ft7in paceman has played 110 T20 matches in his career to date, taking 124 wickets at 25.01.
Meanwhile, the useful right-hander currently sits second on the 2021 LV= Insurance County Championship six-hitting charts with 13, behind Darren Stevens.
Riaz will return to the squad after resolving his visa issues.
Elsewhere, West Indies allrounder and T20 World Cup winner Hayley Matthews will join Welsh Fire after it was confirmed that Suné Luus has returned a positive Covid-19 test and is not able to travel.
“I’m thrilled to be taking part in The Hundred this summer,” said Matthews.
“It’ll be a lot of fun to play in Cardiff alongside the like of Sarah Taylor in front of big crowds.
“The Hundred can help move women’s cricket forward and it’ll be great to take part.”
Fresh off making 174* in his County Championship debut, New Zealander Colin de Grandhomme has signed for Southern Brave in place of Andre Russell, who will not take part in the first edition of The Hundred due to international commitments and Guyana’s status on the UK red list.
“When I got the call to join Southern Brave it was an easy decision,” said de Grandhomme.
“I’ve settled in really well at Hampshire and I’m hoping to create some more fantastic memories at the Ageas Bowl.
“I’m really looking forward to linking up with Devon Conway again and all of the guys can’t wait to get going.”
Adelaide Strikers batter Katie Mack has been signed by Birmingham Phoenix as a replacement for Ellyse Perry, who has withdrawn from the competition due to personal reasons. Amy Jones will now captain the side.
Finally, Ollie Pope will miss the start of The Hundred as he recovers from a quad injury, while Alice Monaghan replaces Hannah Jones at London Spirit.
For more information on The Hundred or for tickets head to www.thehundred.com.