Ross Taylor and Trent Boult return to New Zealand squad ahead of final South Africa Test

New Zealand duo Ross Taylor and Trent Boult will rejoin the squad ahead of the third Test against South Africa, in a much-needed boost for the Kiwis.

The Proteas wrapped up the second Test inside three days in Wellington on Saturday to lead the three-match series 1-0, with the hosts having struggled with little depth to their side.

New Zealand batting coach Craig McMillan confirmed batsman Taylor's and fast bowler Boult's returns but warned there was no guarantee that either would play in Hamilton next weekend.

"You can't take players into a Test against South Africa who aren't fully fit," McMillan said.

"I haven't spoken to Taylor for a couple of days but I'm sure he's keen. He loves playing there and he's done well in recent times."

Taylor tore a calf and Boult suffered upper leg soreness during the first Test in Dunedin, which was drawn.

McMillan described the performance in the second Test as "unacceptable" but said that did not mean there would be wholesale changes to the line-up.

"We've got the best players in New Zealand in the squad," McMillan said.

"They certainly showed in Dunedin that they are good enough to play well and compete. Yesterday they didn't stand up. Yesterday was a terrible day.

"To lose within three days is unacceptable and the group is hurting and disappointed."