Manager Sam Allardyce says it was more important West Ham retained midfielder Mohamed Diame rather than make any more signings on transfer deadline day.
Speculation had surrounded Diame, 25, but the window closed with the Senegalese still at the club.
Allardyce said: "The most important thing at the end of yesterday was probably keeping hold of Mo Diame."
West Ham had brought in five players earlier in January, though Allardyce failed to add to that on Thursday.
Allardyce had suggested Diame could still leave if any side met the release clause in his contract. Despite links to Arsenal, this did not occur, with fellow defensive midfielder Alou Diarra and goalkeeper Stephen Henderson making the only late exits.
"For us we haven't got the results we wanted to try and get for one reason or another but we haven't gone too heavy into the financial side of the market," Allardyce added.
"You're always disappointed in this window, I've never been delighted at the end of a window, in January anyway. It is always ferocious in terms of what you want to do but we have done as well as we possibly can do."