West Ham co-chairman David Sullivan has told the club's official website that the signing of Angelo Ogbonna shows how ambitious the Hammers are.
Having already landed the likes of Darren Randolph, Pedro Obiang and Dimitri Payet, West Ham added another big signing on Friday with the capture of Ogbonna.
The Italian international, 27, had fallen out of favour at Juventus, and chose to leave the Champions League finalists in order to play first team football at West Ham.
Ogbonna is a major coup for the Hammers, who are gearing up for their big move to the Olympic Stadium next year by signing a number of big-name players.
Co-chairman David Sullivan helped secure the deal, and told the club's official website that Ogbonna will be a 'great signing' for West Ham, who are flexing their muscles in the transfer market this summer.
"He is a great signing for the Club and shows the ambition we have getting yet another international player for a sizeable fee," said Sullivan. "I think this strengthens us in a department we have had injuries in season after season and been left short."
How many more signings do West Ham need?
With four signings already completed, West Ham have made great inroads into adding to their squad, but players may still be needed.
Re-signing last season's loanees Carl Jenkinson and Alex Song should be priorities for West Ham, but new manager Slaven Bilic could also look to strengthen other areas.
Another striker could be targeted given Andy Carroll's recent injury problems, and a winger may also be on Bilic's shortlist if he wants to play the 4-2-3-1 system that he used at Besiktas. Even after the spending spree so far, the Hammers could yet bring in even more players this summer.