Scott Wisemantel will join Eddie Jones’ coaching staff for the tour to South Africa as an attack consultant.
The 48-year-old Australian was recently backs coach for Top 14 club Montpellier working with Jake White.
Following the conclusion of the Premiership semi finals next weekend a final training squad will be confirmed to prepare for the Barbarians match.
England will play South Africa in three Tests in Johannesburg (9 June), Bloemfontein (16 June) and Cape Town (23 June). All matches kick off at 1705 local time (1605 BST).