London Irish tighthead prop CJ van der Linde has returned to South Africa to undergo surgery on a pectoral injury.
He will remain in South Africa to continue his rehab programme.
Van der Linde has made only one appearance for the Exiles since joining last year in a disastrous move so far for both parties. His one outing lasted 20 minutes against the Scarlets in the LV= Cup.
His absence leaves Irish with only Jamie Hagan and Leo Halavatau available at tighthead prop, with first-choice Halani Aulika having missed most of the season due to injury.