Ange Postecoglou has said James Maddison has picked up a calf strain and will be out of action for two to three weeks.
The midfielder missed Sunday's Premier League clash with Leicester City after he was reported to have been feeling soreness following our victory over Hoffenheim last time out in the Europa League.
And, following checks, it has been confirmed that Madders has picked up an injury and will now miss the next few weeks of action.
"Madders has got a calf strain," Ange said. "So he is probably two or three weeks (out) for us."
Speaking to us later, Ange reiterated: "We've now further information on Madders, who missed out at the weekend. He's got a bit of a calf strain, so he'll miss a couple of weeks."
Our number 10 joins Guglielmo Vicario, Cristian Romero, Destiny Udogie, Wilson Odobert, Brennan Johnson, Timo Werner and Dominic Solanke on our injury list.
Antonin Kinsky, Sergio Reguilon, Djed Spence and Yang-Min Hyeok are ineligible for the clash with Elfsborg.