A new striker and a left-back are top of Grant's priority list - and he admitted West Ham will struggle to escape the relegation dogfight without new recruits.
"Everybody is aware of the financial situation. The owners took over the club in more than £100m of debt and they are doing everything to deal with this," he said.
"We need a stronger squad. We have a lot of long-term injuries and we will do everything to make the squad stronger because we need it, otherwise it will not be easy to continue like this."
Grant said he was surprised by the renewed speculation over his future following the Newcastle defeat, given that West Ham had picked up eight points from a possible 12 over Christmas and the new year.
"They say you are only as good as your last result but in our last five games we drew two and we won two," he said.
"You have to analyse the whole situation and the owners are happy."
West Ham's FA Cup home tie against Barnsley is followed on Tuesday by the first leg of their Carling Cup semi-final against Birmingham, which is also being played at Upton Park.
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