Kieran Tierney is a doubt for Celtic's Old Firm game against Rangers on Sunday.
Interim manager Neil Lennon confirmed the left-back, who missed Scotland's European Championship qualifying double-header against Kazakhstan and San Marino with a calf injury, will be assessed ahead of Sunday's game, which is live on Sky Sports Football.
He said: "Kieran has had a bit of a reaction today [Friday] and may be a doubt. We will have to assess him tomorrow.
"It is the same issue and we will leave it maybe as late as possible to see how it is.
"He looked uncomfortable so we will give it 24 hours to see how it goes."
Meanwhile, Lennon insists Sunday's Old Firm game at Parkhead will have no bearing on his prospects of getting the Celtic job again on a full-time basis.
The former Celtic skipper and boss has made a good start to his second tenure in the dugout and the club remains on course for an unprecedented triple domestic treble, with a 10-point lead over Rangers at the top of the Ladbrokes Premiership with eight games remaining.
My role here does not depend on Sunday, result-wise. It will depend on whether I can deliver the trophies, I assume, and in particular the league title.
He said: "Certainly my role here does not depend on Sunday, result-wise. It will depend on whether I can deliver the trophies, I assume, and in particular the league title.
"Sunday's game, win or lose or draw, I am not sure will have a huge effect either way.
"Everyone is speculating and second-guessing but as far as I'm aware my remit here doesn't revolve around one game or two games.
"It revolves around what I have done since coming in the door."
Lennon, however, admits victory over Steven Gerrard's side would go a long way to making it eight title wins in a row.
He said: "It would be hammer blow [to Rangers] but again, not insurmountable.
"Again we are talking hypothetically. The objective is to win the game whenever we play our nearest rivals so that is not going to change and the mindset will be, 'we are at home and take the game to Rangers at every opportunity'.
"I am feeling quite calm at the minute.
"I am trying not to get too distracted by all the noise and the hype that goes around it so I have just been concentrating on what we are doing on a day-to-day basis and preparing for another big game."