The Arsenal boss was also non-committal when asked about the future of Aaron Ramsey who is expected to sign a pre-contract agreement with Juventus.
"We can't sign with payment for one player", Emery said at a news conference on Thursday.
It's unbelievable that the Gunners can only afford to loan players during this transfer window considering the size and revenue of the club.
"I know this player, he is a very good player", said Emery. Emery said he expects to see the same level of commitment from the 28-year-old when his side travel to West Ham in the Premier League on Saturday.
"If we can find one player who can help us like we need, with the quality and a different player for getting in our squad, we are going to do it". "In the last match [against Blackpool in the FA Cup] I was very happy with him".More news: Nvidia Announces RTX 2060 for $349; Coming January 15
"We can not sign permanently".
'We are working, and also thinking and speaking with our performance [analyst] Darren [Burgess] and Julen Masach [strength and conditioning coach], for this week and this month.
"We both spoke about the situation with respect from him and from us".
"I want his behaviour and his focus to be on West Ham on Saturday".
Arsenal confirmed that Shkodran Mustafi, Laurent Koscielny, Hector Bellerin, Nacho Monreal, Konstantinos Mavropanos and Mesut Ozil were all back in full training ahead of facing West Ham.
He has previously said Ozil lacks the physicality to compete in tough matches away from home and West Ham should provide tough opposition at their London Stadium home.
Meanwhile, Mesut Ozil has shaken off his own injury problem and is available for selection.