Cameron Carter-Vickers has been ruled out for Celtic against Borussia Dortmund.
The centre-back was not involved in the win over St Johnstone at the weekend through injury.
And Brendan Rodgers has now confirmed the defender will be unavailable for the Champions League match away against Borussia Dortmund.
Confirming the injury blow, Rodgers said: "Cam is not available. We'll see what he's like going into next weekend but he's not here for this evening.”
“Clearly he's a top class player for us. He's missed a little bit of Champions League football in his time.
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"Five of the 12 games that the club has played, he's unfortunately not been able to play in. But yes, we've got other players.
"It's always an opportunity for someone else to come in and hopefully we can get Cam back sooner rather than later.
“But like I say, we can't overthink it. We will rely on a collective.
"There's not one player that brings our results and how we've been this season. Of course he's a very important player, Cam. But for us to get a result tomorrow evening, it will be by the collective.”