Celtic boss Neil Lennon said earlier this month that the Bhoys would sign a left-back if Kieran Tierney is sold in the summer to Arsenal.
The Gunners have had bids rejected for the Celtic left-back, but they are expected to make a late move for the Scotland international.
Celtic are adamant that they will not sell him for anything less than £25 million, and it seems the Bhoys have already lined up a potential replacement.
According to reports from The Scottish Sun, the Hoops are monitoring the 22-year-old who has been valued at around £7 million by his club.