article_snippet.sent: Enner Valencia (left) is expected to return at the Etihad Stadium, but a thigh strain has ruled out Diafra Sakho .
article_snippet.sent: West Ham will be without Senegal forward Diafra Sakho because of a thigh strain, but Enner Valencia (left) has recovered from a foot problem and so will lead the front line alongside veteran striker Carlton Cole.
highlights_snippet.sent: West Ham will be without Diafra Sakho but Enner Valencia is due to return .