Manchester United's Tyrell Malacia is being considered by Celtic if they can't finalize a move for Kieran Tierney.
Celtic have a pre-contract agreement with left-back Tierney to return in the summer.
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However, they hope to bring him in this month, with Greg Taylor as their only recognized left-back.
If Tierney's move doesn't happen, Celtic may look to Malacia, who has just returned from an 18-month injury layoff.
Malacia isn't expected to be a regular under Ruben Amorim, and Celtic might consider a loan move.
Real Betis is also interested in Malacia, with United close to signing Patrick Dorgu from Lecce.