The left-back sustained a knee issue in Arsenal’s 3-0 loss to Liverpool in the Premier League and faces up to six weeks on the sidelines as a result.
On-loan Real Madrid midfielder Martin Odegaard is also set to miss Thursday’s home fixture against Slavia Prague due to a minor ankle injury, while centre-back David Luiz joins Tierney in missing out due to an issue with his knee.
Elsewhere, however, there is positive news for Gunners coach Mikel Arteta, who welcomes back Bukayo Saka, Emile Smith Rowe and Granit Xhaka following their recoveries from injuries.
Arsenal provisional squad to face Slavia Prague: Leno, Ryan, Bellerin, Chambers, Gabriel, Mari, Holding, Cedric, Ceballos, Elneny, Partey, Xhaka, Saka, Odegaard, Smith Rowe, Willian, Aubameyang, Lacazette, Nketiah, Martinelli, Balogun.
PA contributed to this report.
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