Manchester United manager Jose Mourinho says he is “not confident” of signing another player before Thursday’s transfer deadline at 17:00 BST.
Mourinho has repeatedly expressed a desire to bring in additional signings throughout pre-season with a central defender top of his list.
However, despite links to numerous targets, United are yet to reinforce.
“The market closes today. It is time for me to stop thinking about the market,” he said.
“I am not confident. I have to focus on the players I have and the next few matches.”
United have so far signed three players this summer – Brazil midfielder Fred for £47m, Portuguese defender Diogo Dalot and third-choice goalkeeper Lee Grant.
But Mourinho has been keen on bolstering his squad further after they finished second last season, 19 points behind champions Manchester City.