Former Tottenham Hotspur and Manchester United striker Dimitar Berbatov has told United boss Ole Gunnar Solskjaer that he needs to make additions during the last week of the January transfer window, but has warned the Norwegian that deals may be difficult to do given the team's current form.
The Red Devils are in fifth place in the table, six points adrift of Chelsea in fourth, having lost their last two league games.
The latest defeat came at the hands of Burnley, with Solskjaer's men losing 2-1.
Manchester United have been linked with many names during the window, including Tottenham target Bruno Fernandes, and Berbatov has highlighted the positions that they do need add to over the next few days.
"The transfer window is open for another six days and for me they must get some players in that will do the job and help them," he told Betfair.
"With Marcus Rashford out, they need a striker and they also need two players in midfield because we don't know how long Pogba is out for and they need someone there to play and they need to get some player in."
However, the former striker also has a warning for the club in regards to attracting players to Old Trafford.
"Some players may take a look at United and say 'I don't want to go there because I can't save the team on my own, I need others around me'. So United need to go for a few players so that they can entice good players to come and accept an offer," he added.
"Even if it is difficult to try and get reinforcements in before this window shuts, they need to make the effort and show that they are trying to get some good players in to help them get out of this position."
Berbatov added that clubs such as Tottenham, Arsenal and Chelsea could steal a march on his old club during this window, which shows the state that the club is currently in.
"The sad part is, United will now have to work hard to convince players to come," he said
"In the past, you only had to say the name 'Manchester United' and you were there asking where do you sign. If you asked a group of players now, out of Manchester United and other big teams where would they like to go, United would probably be the last place they'd want to go, which is really depressing, and it shows just how much they have declined.
"It is what it is and whoever is in charge of signing players needs to go and speak to people and do their best because if the slide continues then things will only get worse."
