Emery also offered an update on Aaron Ramsey following suggestions the midfielder is set to join Juventus in the summer after reportedly singing a £140,000 a week, five-year contract with the Italian champions.
Any reinforcements brought in during the January transfer window will only be on a short-term basis.
Last January the north London club spent £56 million to sign Pierre-Emerick Aubameyang from Borussia Dortmund and the striker has proved his worth, scoring 26 goals in 40 games.
"Only loan players", Emery said in his pre-match press conference before being asked about Denis Suarez, one of the players linked with a loan move to the Emirates.
Emery worked with the former Manchester City player at Sevilla, but said: "I do not know his situation".
"We can not sign (players) permanently", he said.
Emery also praised the attitude of Aaron Ramsey as the Wales worldwide continues to be linked with a move away from the Emirates Stadium.
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The Arsenal boss called him "a very good player", but told reporters he "cannot say any more". The club is telling me each moment that different situations can happen for recruitment.
"I know the club is working on possibilities of which players can help us with big performances like we need now".
"I respect his decision a lot".
"We pushed him and he was playing three matches during the week, but not ninety minutes each match".