Chievo scored twice in the last three minutes this afternoon to keep Pescara bottom of Serie A.
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Emmanuel Cascione was twice set up from close range, but the forward could not direct a pair of headers on target.
The home side were punished for their wasteful finishing late on by a clinical Chievo counter.
Substitute Adrian Stoian was on hand to break the deadlock, finishing a sweeping break with a curling shot that went straight into the top corner.
In stoppage time Thereau made all three points safe for the Flying Donkeys after turning home with a measured effort.
Defeat for Pescara keeps them five points from safety, while Chievo are now 10 points clear of the drop zone.