Frank McAvennie suggested that West Ham should keep Grady Diangana this summer after West Brom tabled a formal bid for the winger.

The Irons legend, speaking exclusively to Football Insider correspondent Dylan Childs, claimed that the 22-year-old has brought out the best in Sebastien Haller during preseason.

Football Insider revealed earlier today that the Baggies have tabled a £12million offer for the attacker that spent last season on loan at The Hawthorns.

The Hammers hierarchy want a fee of up to £20million, including add-ons and a release clause, in any transfer package.

Diangana and Haller have combined well for David Moyes’s side in a preseason that has seen resounding wins against Ipswich, Wycombe and Brentford.

When asked by Football Insider for his assessment of the Diangana situation, McAvennie said: “Haller has been talking about Diangana.

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“He is playing better now because he has players like Diangana in and around him.

“Diangana is still a young boy and the fans will give him time. Rather than playing someone because you have spent money on them, put the boys in. Let them grow up on the pitch. That is where you learn.

“Moyes has been looking at Diangana every day in training and he will know if he can make it or not.”

When speaking on his relationship with Diangana last week, Haller said: “Everyone knows the quality he has and then he went on loan to West Brom and everyone knows he performed pretty well.

“We are all happy to have him here and we are going to try to use his quality and strength, me most of all. Hopefully he will be giving me even more assists in the future.”

In other West Ham news, Danny Mills has told Football Insider that the Hammers are “playing a huge game of poker” after transfer development.