Midfielder Slater is the more likely of the pair to face the Dons, with Italian defender Pascali still bothered by a swollen ankle he suffered when blocking a shot in training.
Pascali should be available for Kilmarnock’s post-split fixtures, although they also have to play leaders Celtic on Wednesday before then and could still come into consideration for that game.
Aberdeen boss Derek McInnes has no new injuries to deal with and could have Ryan Jack available after the midfielder sat out Wednesday’s 1-0 win over Inverness Caledonian Thistle through injury.
Captain Russell Anderson is back training with the squad after a long-term knee injury, but the 36-year-old will not be rushed back into action, having been sidelined since August.
They will be looking to extend a fine run of form against Killie, who they have beaten in their last five meetings including 2-0 and 1-0 victories this season.
Aberdeen manager Derek McInnes said: “There’s still work to be done and it would be foolish to think otherwise. Our form in the last 10 games of last season didn’t replicate what had been previous in the season. Our form wasn’t convincing.
“It’s in our hands to make sure we go and finish second. It’s not in our hands to go and finish first. Regardless of where we end up, if we continue in a similar vein, we’ll be pleased with our work this year.”