Slavia Prague scored a dramatic stoppage time equaliser to leave Arsenal's Europa League ambitions hanging in the balance.

Substitute Nicolas Pepe thought he had earned the Gunners a slender quarter-final first-leg advantage when he broke the deadlock in the 86th minute.

But Tomas Holes headed home in the dying moments of the game from close range to give Slavia Prague a precious away goal.

The second leg in Prague takes place next Thursday.