West Ham United fans react on Twitter to Issa Diop's performance against Preston

(From L) Toulouse's French midfielder Yannick Cahuzac, Paris Saint-Germain's Brazilian forward Neymar Jr and Toulouse's French defender Issa Diop go for the ball during the French L1...

Manuel Pellegrini brought Issa Diop to West Ham United this summer, but he is yet to impress the London Stadium crowd.

Lyon's Dutch forward Memphis Depay (R) fights for the ball with Toulouse's French defender Issa Diop (L) during the French L1 football match Olympique Lyonnais (OL) vs Toulouse FC (TFC) at...

West Ham United fans are already asking questions of Issa Diop.

Diop only joined West Ham this summer, but his initial performances in friendlies have not impressed the London Stadium crowd too much.

Lille's Brazilian Forward Luiz De Araujo (C) vies with Toulouse's French defender Issa Diop during the French L1 football match Toulouse against Lille on May 6, 2018 at the Municipal...

West Ham drew 2-2 with Preston North End today, with Manuel Pellegrini’s side having a lot to work on defensively.

And West Ham fans have criticised Diop’s performance, with many already asking questions of the centre-back.

Diop was one of West Ham’s more expensive signings this summer, and is expected to have a key role to play.

The powerful centre-back looks likely to accompany Angelo Ogbonna in the heart of West Ham’s defence.

The Hammers were shaky at the back last term, and will want to tighten things up before the competitive action starts.

Pellegrini’s side begin their Premier League campaign with a match against Liverpool at Anfield.

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