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Cresswell, who has been struggling with a shoulder problem in recent weeks, missed Monday night's semi-final win over Stevenage due to an eye infection, while McDonald has been nursing a hamstring problem and did not come out for the second half.
"We still aren't sure at this stage what the situation is with Kevin and Richard, but hopefully both will be available," Wilson told the club's official website.
Wilson said he is anxious to keep his squad's preparation for the clash with Yorkshire rivals Huddersfield as routine as possible.
He added: "There will be plenty of external demands in the lead-up to the game but, for us it will be business as usual. We won't change the way we prepare for this game, why would we when we are so near to our aim for the season.
"We're looking forward to playing at Wembley, who wouldn't be? It will be a special day for the fans and hopefully we can send them all home happy, promotion has been the aim all season and nothing has changed in the last few weeks."
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