West Ham co-owners

West Ham may follow up the £20million sale of Sebastien Haller with the big-money exit of Issa Diop.

That is according to ex-Arsenal and Everton striker Kevin Campbell, speaking exclusively to Football Insider about another possible blockbuster sale.

This site revealed on Thursday morning that Haller is in advanced talks to join Ajax for £20million and had been given permission to undergo a medical in Amsterdam, while Robert Snodgrass is heading to West Brom.

But the Ivory Coast and Scotland internationals may not be the only big-name Hammers exits this month.

Diop, 23, has made just three Premier League starts among five appearances this season and not figured only once since 7 November despite being fit and available.

Asked by Football Insider why Diop has been frozen out of the West Ham team, Campbell said:

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“There must be something going on in the background with David Moyes. I am not too sure what it is but what you have a quality player like that not getting in the side, it is not because of his ability. It is not because of his talent.

“It is because something is going on behind the scenes. West Ham might want to cash in.

“They might want to reinvest elsewhere. Moyes may think that he already has a defence that he can work with, so he can sell Diop and strengthen in other areas.”

Diop has been an unused substitute for West Ham’s last four Premier League matches.

Moyes’ first choice centre-back is Angelo Ogbonna and he was paired with loanee Craig Dawson in the 1-0 win over Everton last weekend.

In other news, West Ham race to sign 6ft 5in centre-back ahead of Leeds United.