Derek McInnes has refused to rule out another signing in January, but only if they are the same quality as Niall McGinn.
The Dons boss insists he is happy with his squad size having secured McGinn on a three-and-a-half year deal until summer 2021.
However, McInnes would not rule out another winter window addition if a quality player becomes available – within the Pittodrie club’s budget.
McInnes, who will lead out the Reds at home to Hearts today, said: “You don’t normally get too many opportunities to sign good players in the January window.
“It is always a month that is a bit more difficult.
“If someone came up that was a similar quality to Niall then you would maybe look if you can bring that in.
“But the first port of call for us is affordability and whether we can do it.
“Whether we can or whether we can’t I am happy with the numbers in the squad anyway.
“The emergence of some of the younger ones this year has bolstered numbers.
“However, I can’t say there definitely won’t be any more changes in January.”
McGinn will officially become a Dons player again when the transfer window opens on Monday – January 1.
The Northern Ireland international, capped more than 50 times, rejected a new contract at Pittodrie last season to move to South Korean side Gwangju.
When he terminated his contract last month it opened the way for a return to the Dons having spent five years at the club.
Hibs, Hearts and MK Dons were keen on landing the winger.
“I am absolutely delighted to have Niall back,” said McInnes.
“When Niall became a free agent I stated if he was available and showed us any encouragement we would be interested in working with him again.
“Niall showed a willingness to come back.
“There were a few other clubs interested.
“When you have a player of Niall’s ability free it would be naive to think that wouldn’t be the case.
“You have to make sure you do your bit to get the player but we were always confident what we had over other clubs was that Niall had worked here before.
“There was the way he felt for the club and the affection everyone here has for Niall as well.
“I think that was quite key in winning that fight as he knew exactly what he was coming back to.”
McInnes and assistant Tony Docherty had kept in close touch with McGinn. Having left South Korea, the winger had surgery on a hernia but is now ready to kick-start his second spell as a Don.
McInnes said: “Niall had a procedure on a little hernia complaint that’s been bothering him for the last while and I think that played an impact on his time out in South Korea.
“He had that tidied up three weeks ago so he’s on schedule to be in full training when we’re back from our winter training camp.”
Aberdeen will today host Hearts, looking to end 2017 in second spot in the Premiership.
McInnes said: “Hearts will be tough as Craig (Levein) has put his stamp on the team.
“Hearts are really difficult to beat and have secured six clean sheets in seven.
“Craig is showing his experience as a manager in getting a solid base to work from. It might be another tight game and hopefully we have the quality to win.”
Andy Considine and Greg Stewart were to be given fitness tests this morning to assess knocks sustained in the 1-0 win over Partick.
Striker Stevie May (ankle) and midfielder Greg Tansey (groin) are both ruled out.