Despite having already signed Issa Diop and Fabian Balbuena, West Ham and manager Manuel Pellegrini still appear to be on the look out for another central defender.

According to beIN Sports Turkey, the Hammers have made a £19m bid for Besiktas' Domagoj Vida.

£10.8m (via Transfermarkt) Vida starred for Croatia in the World Cup and has attracted interest from a host of clubs, but West Ham look to be the ones to have made the first move which could have implications for some of the current members of their squad.

The Breakdown

Given the fact that big money has been spent on Diop, the Frenchman is likely to be one of the first names on Pellegrini's team-sheet for the opening games of the new season.

Therefore, should Vida sign, that leaves Balbuena, Angelo Ogbonna and Winston Reid with bench roles unless Pellegrini plans to use a three-man defence.

Pellegrini, though, is expected to line up with a flat back four, leaving the futures of Ogbonna and Reid bleak if Vida arrives.

Reid already faces the difficult task of convincing the former Manchester City boss.

Surgery on a swollen knee has ruled out the New Zealand captain for up to three months, meaning by the time he returns from injury, West Ham could very much have a settled central defensive partnership of Diop, Vida or another similar combination.

As for Ogbonna, as good of a defender he is, the 30-year-old can be very inconsistent with his performances, and the additions of two new central defenders with the possible arrival of another, is perhaps an indication of Pellegrini's concern.

Ogbonna has been one of West Ham's better signings in recent transfer windows, while Reid has been a good servant to the club, but the potential signing of Vida could be the beginning of the end for the pair.