Derek McInnes fears Aberdeen will have to contend with a "caged animal" in the form of Celtic's Ryan Christie on Sunday.
Christie returned to action against Milan on Thursday after spending 14 days in self-isolation, having been deemed a close contact of Stuart Armstrong when the Southampton midfielder tested positive for Covid on international duty.
The 25-year-old missed Scotland's three matches and Celtic's defeat against Rangers last weekend, and Dons boss McInnes believes the forward will be a threat at Pittodrie now that he's back in contention.
McInnes said: "Knowing how much Ryan loves his football, then he will have been like a caged animal. Getting back out on the pitch will mean everything to him.
"There will be a frustration there in that he hasn't done a lot wrong and has returned a negative test. But knowing how enthusiastic wee Ryan is for his football and how much he loves to get his boots on to train and to play, then I'm sure he will be eager to get back.
"He's one of the many players that Celtic have who can make a difference in a game.
"But there are no doubts he will be expecting to go and I don't expect anything different."