Arsenal endured a quiet transfer deadline day in terms of outgoings but did cash in on Lucas Perez with the striker joining West Ham on a permanent deal.
With transfer windows across Europe still open until the end of the month, several players could still depart.
“We only have three players: Carl Jenkinson, David Ospina and Joel Campbell, with the possibility to leave,” Emery said.
Aaron Ramsey has also been linked with a move away from north London with the Welshman yet to sign a new deal.
The 27-year-old is under contract with the Gunners until the end of the season and Emery is hoping he commits his future to the club.
“That’s not my work,” Emery said on Ramsey’s contract situation.
“For me it’s very important he stays with us. His experience here in Arsenal and the Premier League is very important and will give us all the information and performances in his quality.
“Then, the contract is for speaking with the club and the players.”
Emery is busy preparing for Arsenal’s first game of the season against Manchester City on Sunday night.
Champions City are the heavy favourites to defend their title and an impressive pre-season could cause concern for Emery’s new-look Arsenal team this weekend.
But the Spaniard is looking forward to the occasion and hopes their own good work in training can be carried into the game.
“We are excited. We have a lot of ambition to start [well] on Sunday against the last winners of the Premier League,” he added.
“Also, I think that it’s a big and great match that we can play to start this season.
“We are working to improve each match and each training session. But Sunday, we need to show on the pitch our performance at a big level.
“The opposition is demanding our best moments tactically and also individually. It’s for that, that on Sunday I want first to be together with our supporters.”
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