| 27 Aug 21 | M. Longstaff Matthew Longstaff |  Newcastle UnitedNEW | → |  AberdeenABER | Loan |
| 27 Aug 21 | M. Longstaff Matthew Longstaff | Newcastle UnitedNEW | → | AberdeenABER | Loan |
| 24 Aug 21 | A. Samuels Austin Samuels |  Wolverhampton WanderersWOL | → | AberdeenABER | Loan |
| 24 Aug 21 | A. Samuels Austin Samuels | Wolverhampton WanderersWOL | → | AberdeenABER | Loan |
| 01 Jul 21 | T. Jenks Teddy Jenks |  Brighton & Hove AlbionBHA | → | AberdeenABER | Loan |
| 01 Jul 21 | T. Jenks Teddy Jenks | Brighton & Hove AlbionBHA | → | AberdeenABER | Loan |
| 28 Jun 21 | C. Ramirez Christian Ramirez |  Houston Dynamo FCHOU | → | AberdeenABER | Undisclosed |
| 28 Jun 21 | C. Ramirez Christian Ramirez | Houston Dynamo FCHOU | → | AberdeenABER | Undisclosed |
| 18 Feb 21 | R. Hernández Ronald Hernández | AberdeenABER | → |  Atlanta United FCATL | Loan |
| 18 Feb 21 | R. Hernández Ronald Hernández | AberdeenABER | → | Atlanta United FCATL | Loan |
| 18 Feb 21 | R. Hernández Ronald Hernández | AberdeenABER | → | Atlanta United FCATL | Loan |
| 18 Feb 21 | R. Hernández Ronald Hernández | AberdeenABER | → | Atlanta United FCATL | Loan |