Manchester United boss Louis van Gaal wants to "improve" his squad in the January transfer window - but admits it is not the "ideal time to do business".
United are fifth in the Premier League and their victory over Swansea last week ended an eight-game winless run.
They face Sheffield United in the FA Cup on Saturday (17:30 GMT).
In the programme for that match, Van Gaal writes he would strengthen "if the opportunity does arise" and he and his coaches feel "something can be done".
But he adds: "I don't see January as the ideal time to do business."
Van Gaal, 64, is contracted to United until the end of the 2016-17 season but his position came under scrutiny as his side slipped down the table and went out of the Champions League.
The Dutchman's possession-based approach has been criticised by fans, former players and the media.
The Red Devils have had seven goalless draws so far this season, six of them at home.