Ange Postecoglou stated that "there's still potential movement" in the January transfer window for Celtic, but he implied that departures are more likely than additional arrivals.
Oh Hyeongyu, a forward, became the club's fifth acquisition this week. The transfer window closes on Tuesday.
Moritz Jenz and Josip Juranovic have both left, and Giorgos Giakoumakis has been heavily linked to a move.
Postecoglou responded when asked about transfers, "More likely out than in.".
"At the moment, nothing is certain. The choice of their career path is up to the individual player, who weighs all of their options.
"There is still a good deal of rumor surrounding him (Giakoumakis). It's important to observe how he is training and how he is feeling about things until something is resolved in either direction. ".
The Australian jokingly said, "I could say, 'yes,' but then it would be boring for the next few days for all of us," when asked if Celtic's hiring was complete. I'll just keep moving and see what happens; if these questions come up again over the weekend, I'll be ready. ".
Along with Oh from South Korea, Alastair Johnston from Canada, Tomoki Iwata from Japan, and Yuki Kobayashi from Japan, a defender, have all arrived at the Scottish Premiership leaders this month.
In light of the striker's lack of action since November, Postecoglou was questioned about whether Oh would play against Dundee United at Tannadice on Sunday.
The manager answered, "We'll see how he does. His physical health is excellent. I want to involve him as soon as possible.
It seems to have taken a very long time to happen. I'll be honest; I assumed he would be the first person inside the building when we pretty quickly identified him.
His club didn't want to let him go very much. His form just kept getting better and better. It's true that there were times when I didn't believe it would happen.
"Really pleased to have completed it. I'm so happy to include him in the plan. Although he is young, he is very mature and driven to have an impact.