Tottenham boss Ange Postecoglou has urged the club to swiftly complete its January business.
The North London side are top of the Premier League at present, two points ahead of rivals Arsenal.
As they prepare to take on Chelsea on Monday, their Australian head coach admitted that he would prefer to see new players coming in as early as the first week of January.
During a press conference, Postecoglou said: "It is important they [Johan Lange and Rob Mackenzie behind the scenes] come in now.
"The January window, like for every club, is an important one.
"My view on the January one is that if you can get your business done early in the window it certainly is more helpful because you leave it until the end of January and sometimes what you train to gain you've missed that opportunity by waiting a whole month.
"That's sometimes out of your control so having Johan in is good. I'm sure we'll have a lot of discussions between now and then and I'm looking forward to working with him."