Newcastle manager Rafael Benitez said his side "need something in January" after they dropped into the relegation zone with a fourth straight defeat at Arsenal.
The Magpies have lost eight of their last nine Premier League games, gaining just one point from a 2-2 draw at West Brom.
They rose to as high as fourth earlier in the season, and were in sixth place after beating Crystal Palace on 21 October, their last win to date.
"We'll try to bring in some additions that will bring a lift to the team," said Benitez.
Mesut Ozil's brilliant volleyed goal in the first half was enough for Arsene Wenger's side, who dominated until Newcastle rallied late in the game.
Newcastle are reported to be the subject of a £300m takeover bid by PCP Partners, with club owner Mike Ashley said to have recently met with PCP's owner Amanda Staveley.
"The fans know the team will be tough. They also know we need something in January that will help the current squad," the Spaniard added.