Black Caps paceman Tim Southee's participation in next month's 50-overs World Cup will be decided after his surgery for a fractured and dislocated thumb, New Zealand Cricket said Wednesday. Southee faces an operation on Thursday and his World Cup fate will be decided early next week, but New Zealand coach Gary Stead is hopeful the bowler can recover in time. "We've got our fingers crossed the surgery goes well for Tim," Stead said. Southee, New Zealand's Test captain, will have pins or screws inserted in his thumb, Stead said. "Providing the procedure is a success, it will be a matter of ensuring Tim can tolerate the pain and manage the actual wound when returning to train and play," Stead added.