Only a week after destroying the Zenit defence in the first leg of the tie, Moussa Dembele was invisible as Celtic crashed out of Europe after suffering an insipid 3-0 defeat in Russia.
The 21-year-old was a shadow of the player who drove the Hoops onwards in the first leg, aside from a few nice bits of hold-up play at the start of the match the Frenchman failed to perform in a big game, and not for the first time this season.
At first the poor performances could be out down to injury and squad rotation, but now there just seems to be a malaise in his play.
The Celtic first teamer isn’t playing like someone who wants to be at the club, and perhaps his heart isn’t in it after his supposed dream move to the English Premier League failed to materialise in January.
The problem Dembele has though, is that as his performances have got worse in recent weeks, the chances of him getting a move to a big club down south keeps receding.
Dembele and Brendan Rodgers need to find a solution to the problem, and it will be interesting to see if the player starts against Aberdeen on Sunday, a match which has become must-win after the loss to Zenit.
If Dembele starts, the manager still his confidence in him. If he is benched, his days in Glasgow look numbered.
In other Celtic news, Patrick Roberts could return from injury for the match against Aberdeen