That is the view of Sky Sports pundit Liam Rosenior, who says that their whole season depends on it.
Spurs are still doing well in all four competitions but are in the midst of an injury crisis at the moment.
After Harry Kane was ruled out until March after suffering a late injury against Manchester United, Dele Alli suffered a hamstring injury in the win at Fulham on Sunday and is also expected to be out until then.
Lucas Moura has been missing since the 7-0 win at Tranmere but is said to be back in training, while Heung-min Son is away with South Korea on international duty.
“They have to bring someone in this month”
With Chelsea coming up in the Carabao Cup semi-final second leg on Thursday and a trip to Crystal Palace in the FA Cup on Sunday, Spurs could potentially be out of two competitions before the start of next week.
Mauricio Pochettino was the only top flight manager not to bring in any new players in the summer transfer window and this now looks to be coming back to haunt the club.
While they currently occupy third place in the Premier League, the likes of United, Chelsea and Arsenal will be licking their lips at Tottenham’s current predicament.
And Fulham and Hull defender Rosenior thinks that the club have to go out and sign someone or risk it being another season of disappointment.
“They have to bring someone in this month if they want to win a trophy or stay in the top-four race,” he said on Sky Sports’ The Debate.
“Manchester United are coming up hot on the rails. Chelsea and Arsenal are going through difficult moments but they will be there, so Spurs need to bring someone in.”
Fernando Llorente started up front in the absence of Kane as Spurs beat Fulham on Sunday.
Making his first Premier League start of the season, Llorente scored an own goal and also missed several chances and looks short of confidence.
However, Rosenior said: “Tottenham’s squad says you have to stick with him. At the moment I don’t see any other option than sticking with Llorente and trying to get him on form.
“Just as worrying as that was their defensive performance against Fulham in the first half. Davinson Sanchez was out of sorts, Fulham could have scored three or four goals, and if you haven’t got your main goalscorer at one end you need to keep the back door shut.
“I think that will be a worry for Pochettino going into the next game.”
Speaking about the game with Chelsea on Thursday, former Manchester City boss Stuart Pearce has had his say. Spurs lead 1-0 from the first leg.
“I think the injuries have evened the tie out and it will be a wonderful game,” he added.
“I think it’s in Chelsea’s favour but they are finding goals hard to come by.
“If Gonzalo Higuain walks in the door and is fit and available that would give them a big lift but they are not clicking in front of goal at the moment.”