The Welsh actor plays the former lover of Rivera's character in the Kander and Ebb production, but he has been replaced by his understudy for upcoming shows.

A representative for the musical tells Playbill.com, "Roger Rees has not left The Visit, but Tom Nelis will be performing the role of Anton for a number of performances."

According to the theatre site, Rees has already missed a string of shows in recent days, but his absence nor an expected return date have not been announced.

The Visit, based on the satirical 1956 Friedrich Durrenmatt play, opened last month (Apr15) and is nominated for five Tony Awards at the annual prizegiving on 7 June (15).