Chelsea winger Victor Moses will return to Stamford Bridge after his loan spell with West Ham United ended this season.
Hammers co-chairman David Gold confirmed that the Nigerian as well as Carl Jenkinson, Emmanuel Emenike and Alex Song will all return to their parent clubs.
"What we have to ensure now is that we keep that momentum going when we move to the new stadium," Gold told the club's official website.
"That means we will be bringing in some new players to replace the four loan players who have left us – Carl Jenkinson, Victor Moses, Emmanuel Emenike and Alex Song.
"Our intention is to replace them with better quality.
"Of course we have already shown our intent by bringing in Havard Nordtveit, a talented Norwegian player who our fans will enjoy."