Arsenal are set to be without Kieran Tierney for both legs of their Europa League quarter-final clash with Slavia Prague, according to the Evening Standard.
The Scotsman has been a key player for Arsenal under Mikel Arteta, scoring two goals and assisting four across all competitions this season.
In January, Tierney was ruled out for several weeks due to a knee injury, with the left-back returning to action against Manchester City towards the end of February.
Just six games later, Tierney had to be substituted during the 3-0 loss to Liverpool, with the Scotsman limping off with what looked to be a similar injury.