Celtic lost 3-1 to Barcelona in Dublin on Saturday evening - it was a game which featured some comedy defending from Efe Ambrose.
Brendan Rodgers started the game with a centre back partnership of Ambrose and young Corkman Eoghan O'Connell. The 21-year-old appears to be a favourite of Rodgers. O'Connell has expressed his desire to remain at the club this season rather than go out on loan - he wants to fight for a first team place.
If he is to win a regular starting spot, he'll have to fight off the experience of Kolo Toure who the club recently picked up on a free transfer.
There could also be further competition for O'Connell - Man Utd centre-back Paddy McNair.
Following Saturday evening's game, Rodgers was asked about McNair. Quoted by The Sunday Post, the Celtic manager was coy.
I can’t say yes or no to that. There have been so many players who have been linked with Celtic I can’t comment on everyone.
Under Louis van Gaal last season, McNair made eight appearances in the league for Man Utd - three of those were starts. With the acquisition of Eric Bailly, his opportunities at Old Trafford are likely to decrease and it's probable he will be sent out on loan.
Brendan Rodgers has plans beyond McNair too. He wants to bring in four more players before the close of the transfer window.
One of those could be Scott Sinclair. The Aston Villa midfielder has been the subject of several bids from Celtic.
Probably ideally I would like another four in.
Is it doable ? We shall see. It just takes time. I understand that but in terms of assessing the squad before I came in, and likewise having been in now for six weeks or so that is what I would say we would be at.
Sinclair is a young talented lad but he is still an Aston Villa player.
Until anything is done, there is nothing to say.