Newcastle United striker Michael Owen has suffered a fresh injury blow after picking up a thigh injury in training.
The 27-year-old England hitman has been ruled out of Saturday's pre-season friendly at Carlisle United and will be sidelined for around ten days.
"Hopefully, it will be no more than ten days and he should be back," said Magpies boss Sam Allardyce.
"It may be a little early for the Celtic match, but we hope he will be fit to face Juventus on the Sunday."
Meanwhile, Allardyce has revealed he will hold talks with Kieron Dyer following speculation linking the midfielder with a move to West Ham United.
"I suppose I will have to have a chat and a conversation with Kieron to see if he thinks there is anything in it and if there is, we will discuss it privately from there," he continued.
"But at the moment, there is no bid from West Ham, so until Alan Curbishley rings me or the chief executive rings (his Newcastle counterpart) Russell Cushing, then there would be no discussion.
"It has been rumoured in the papers and sometimes there is no smoke without fire.
"But if there's a bid going to come in, I would probably expect a phone call either today or over the weekend because they have lost one of their new players."