Barnet joint head coach Ulrich Landvreugd says the Bees’ priority when the loan window reopens is to sign a centre-back.
The club only have David Stephens and Jack Saville as their recognised central defenders following the sale of Anthony Acheampong to Ebbsfleet United on Saturday.
Although Jordan Brown, Roberto Casabella and Curtis Weston have all filled in at centre-back during different points of the season, Landvreugd says Barnet must bring in defensive reinforcements.
He said: "We want bring in another centre-back and that is our priority. We definitely need another one and we are looking to get one when the loan window reopens next week."
There were no incomings at Barnet before the transfer window closed but strikers Jon Nurse and George Sykes departed on one-month loan deals to Farnborough.
Landvreugd says it is important the attacking pair are playing regularly and believes they will benefit from regular football.
"Playing is better for them than sitting watching on a Saturday," Landvreugd said. "At the moment Jake Hyde is fit and Dani Lopez is fit.
"We also have Harry (Crawford) but he has picked up a little injury, although we didn’t know that when Jon and George left.
"It is important for George to play games and get some minutes. Nursey did very well last month when he came on as a substitute or when he started. So it was a hard decision for Jon and for us but it will be beneficial for him.
"He is one of the most experienced players in the group and that is perhaps what we have missed at times.
"But he is still training with us and is a good influence on the group."
Jake Hyde was linked with a deadline day move away from Barnet but Landvreugd was adamant the rumours were untrue and said the striker will remain at the club until the end of the season.