New Celtic signing Camilo Duran is a doubt for the friendly against Sporting due to illness.
The Colombian remains the Parkhead side's only signing of the summer to date after securing a £5.5 million move to Glasgow from Azerbaijani side Qarabag last week.
He had already been seen training with his new teammates before the announcement so has had plenty of time to get acquainted with them.
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Following a draw with Shelbourne in Dublin last week, Celtic flew out for a camp in Portugal and play Sporting this evening.
Supporters would have been looking forward to seeing their new man in action but that is now in doubt with O'Neill revealing his illness.
He said: “He didn’t train today because he was ill. So we’ll see how he is.”
