New Zealand Rugby (NZR) released a sternly-worded statement just hours before England confirmed Shields' selection, in which the head of professional rugby, Chris Lendrum, said: "We are extremely disappointed that the RFU chose to take this unusual step in seeking this release given that Brad has not yet played rugby in England".
Danny Cipriani has returned to the England fold after an absence of almost three years.
Danny Cipriani has been recalled to the England squad to tour South Africa next month three years after his last appearance, while New Zealand-based backrower Brad Shields was also included for the three-test tour.
Hurricanes captain Brad Shields, set to join Wasps, was one of seven uncapped players in Jones's squad despite being midway through the Super Rugby season.
Cipriani has not represented his country since August 2015, but a series of fine performances for Wasps in the Premiership this season earned the fly-half a call-up.
Meanwhile, Scott Wisemantel has been announced as England's attack coach for the tour of South Africa.
The 30-year-old's sparkling form for Wasps prompted Sir Clive Woodward to state it would be an "utter disgrace" if he were to be overlooked by for the series against the Springboks.
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In the absence of Dylan Hartley due to concussion, Owen Farrell will captain the side. "I've watched him closely and he's looking good".
"They've got a great coach is Rassie Erasmus, he was a very creative coach for the Cheetahs, had a time with the Stormers, he came and did a good job at Munster, he's a bright guy - driven - he always wanted to be the Springbok coach and now he's got the opportunity in probably the best landscape they've had for a number of years".
"My responsibility is to play England-qualified players". Newcastle Falcons' Mark Wilson also returns after a year on the worldwide sidelines, while Bully Vunipola is also in after his recent injury problems.
Jones denied that Shields' selection reflected badly on the England pathway system which is created to promote the best young English talent. He was eligible through England-born parents.
"We didn't play great rugby in the Six Nations, we want to play better rugby in South Africa - we know we are playing a reinvigorated team". The 48-year-old, recently employed as Montpellier's backs coach, has worked with Jones before with Japan and Australia.
England begin their Test series with South Africa in Johannesburg on June 9, followed by games in Bloemfontein on June 16 and Cape Town on June 23.
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