I didn't agree with it but I reckon Forrest was injured and he had already used his wingers from the bench (Palma and Forrest himself).
That aside, Celtic were exposed by almost two identical crosses which were difficult to defend. Aberdeen's last goal came off a terrible pass from Palma when Celtic could have opened Aberdeen up and finished the game. For me the players have to take responsibility and finish off teams- they are not clinical enough. We are weak in defence when teams are direct and put us under pressure.
Aberdeen were very unlucky and they were more than a match for Celtic on the day. Any neutral (and Rangers fans ) watching the game would be supporting them to the hilt. Disappointed that Celtic didn't make their dominance count but that is nothing new. Also got off the hook with a huge penalty overturned when Carter Vickers blatantly kicked the back of his opponent's heel- my understanding is it was brought back for an earlier foul. If I was an Aberdeen fan I would have been spitting teeth.
Bottom line is Celtic are at Hampden Park to compete v Rangers or Hearts on 25th May. Sincerely hope that the Rangers v Hearts game is half as exciting as last night's contest.