Landon Emenalo was confirmed as a Celtic player today but is not in the squad to face Aberdeen tonight.
The left-back has arrived on a season-long loan deal from Chelsea, the Parkhead cub confirming this hours before welcoming Aberdeen to the east end of Glasgow this evening.
They had looked at Greg Tayor as an option but their loan offer was rejected by PAOK, so they proceeded with Emenalo.
The 18-year-old has been recovering from an injury and concerns around that prompted the Taylor bid.
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And Martin O'Neill has confirmed that is the reason he is not in the squad this evening, with the expectation he will be out for a "couple of weeks."
"He's picked up a little injury at this moment, he should be fit in a couple of weeks time," O'Neill told club media.
With Kieran Tierney also sidelined, Liam Scales plays at left-back against Stephen Robinson's side.
Meanwhile, midfielder Joel van den Berg arrived at the stadium on the team bus with the Celtic squad for the game, despite not being confirmed as a signing yet.
Loan arrivals Sam Johnstone, Oliver Sørensen and Shim Mheuka could get their debuts off the bench.