"I'm very excited about the prospects of joining up with both Jacques Rudolph and Colin Ingram and playing for Glamorgan," Parnell said. Rudolph, Glamorgan's captain, is the main overseas signing in Cardiff, while fellow former South Africa international Ingram has joined on a Kolpak deal.
Parnell, who has been capped in all three formats and was a member of South Africa's recent World Cup squad, has taken 118 T20 wickets, with an economy of 7.56. He has previously appeared in the IPL, as well as playing county cricket with Kent and Sussex.
