Arsenal are believed to have submitted a bid for Shakhtar Donetsk defender Mykola Matviyenko.
With Calum Chambers ruled out for the rest of the season and David Luiz suspended for the next three games, Mikel Arteta needed to boost his defence line.
Sky Sports report that the Gunners have opened talks with Shakhtar over a potential loan deal for Ukraine international Matviyenko.
The 23-year-old has 18 months left on his contract and it is understood the Ukrainian club would prefer a £30million permanent deal.
“I’m not going to be discussing any transfer links publicly,” Arteta said.
“It’s something we are trying to do internally and when we have news we will communicate with you guys.
“We are looking at different positions, obviously since I joined we lost Calum [Chambers] and we had other circumstances and injuries in that position so it’s true that at the back we have been short.
“There are other positions as well, depending on what happens in the market that we might need to assess.
“At the moment I am 50/50 [on signings] because this transfer [window] is very complicated and I only want to bring somebody in if I’m convinced he can really improve the level that we have.”