In the meantime, Glen's understudy Patrick Cremin is playing the role of Kuzovkin, as Houston prepares to take over.
Iain Glen's extensive theatre credits include The Crucible (RSC/West End), Hedda Gabler (Almeida/West End), A Streetcar Named Desire (National), The Blue Room (Donmar/Broadway), Martin Guerre (West End), Henry V (RSC), Macbeth (Tron Theatre), Hamlet (Bristol Old Vic) and Road (Royal Court).
Houston has played Troilus in Troilus and Cressida as well as the title roles in Henry V and Coriolanus, all for the RSC. His film credits include Sherlock Holmes and Elizabeth: the Golden Age.
Lucy Bailey's production of Ivan Turgenev's Russian satire, which also stars Richard McCabe, continues at the Old Vic until 22 February 2014.