Mikael Lustig has been an excellent mainstay for Celtic in the six years he has been at the club, but his performance in the 3-0 loss to Zenit shows that his best days look to have been in the past.
The 31-year-old was awful against the Russian side, in both defence and attack, and was particularly culpable at the third goal which killed off the tie.
As he is going off to the World Cup with Sweden in the summer, the time is right to give the other right-backs at the club a run of games, as due to his World Cup commitments Lustig will miss the start of the Champions League qualifiers next season.
The man who should replace the Swede is 19-year-old Anthony Ralston, who has recently returned from a long injury lay-off.
Ralson started against PSG in the Champions League group stages earlier this season, so Brendan Rodgers should have no qualms about replacing Lustig for him against Aberdeen.
Not only would it give the teenager a run in the side but such as been the awfulness of Lustig’s recent performances that it would greatly improve the team if he was left out of the side.
Ralston deserves a run in the side and it should begin on Sunday.
In other Celtic news, Patrick Roberts may return from injury in time to face Aberdeen