There is nothing more frustrating for a management team than seeing the break-up of a side that has not reached its full potential and I think there is a significant prospect of that happening for Neil Lennon.
I would say that the three players that Celtic must worry about heading for the Parkhead exit doors are Gary Hooper, Victor Wanyama and, possibly, Fraser Forster.
There are others whom, if a bid came in for them I would not be surprised, and they would be Joe Ledley and perhaps Adam Matthews. Unfortunately, that is just the bottom line of where Celtic are in the European game.
The context you must place Celtic in is one that is defined by the league they play in and as a result the ability to identify and develop talent and sell it on at profit, is hugely important to keeping Celtic sustainable.
The great news is that the Celtic scouting network under John Park has done a fantastic job in identifying talent like Wanyama and Ki Sung-Yueng, who Celtic made a tidy profit on by selling to Swansea.
I would be confident that John and his contacts can do so again.
The big positive for them is that Celtic's progress through the Champions League will have made the club a far more attractive prospect to a far wider range of players over the coming summer.
That is definitely something that can benefit the club if a re-building job, as seems likely, is required.