"I think there are three or four positions - it depends on the budget," he told West Ham TV.
"You would say there is still room for a young central defender, particularly a left-footed one because we do run with three and not four.
"Ideally, you would have four." He added: "You would also say we need another left-back to go along with Aaron and I think a front-line player and the possibility of a midfield player as well."
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