The Czech goalkeeper was forced to call for medical treatment on 37 minutes after an attempt to kick a Shkodran Mustafi pass.
Cech disappeared up the tunnel before being replaced by David Ospina, who was making his first appearance in the Premier League this season.
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Ospina was at fault as West Brom substitute Robson Hal-Kanu gave the home side a 2-1 lead early in the second half.
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