Murray Davidson knee injury blow for St Johnstone
Davidson initially tried to play on after having treatment but he broke down again and was substituted a minute before the half-time whistle in Yerevan.
The Scotland international midfielder missed eight months with a ruptured knee tendon last year and St Johnstone revealed that early reports on the injury suggested it was serious and “possibly cruciate”.
The news capped a bad start to St Johnstone’s Europa League adventure. Mihran Manasyan’s second-half winner gave the Armenian side a narrow lead ahead of Thursday’s return leg in Perth.