The club have recalled the 17 year old and Dundee will hope he can help their attacking options.
The manager said “We’ve not got big numbers,” he stressed.
“We travelled to Pittodrie with 18 players – that’s all we had.
“So it will probably need to be the same squad that turns up on Wednesday.
“They just need to make sure that their rest and recovery is really important now over the next three or four days.”
Hartley also reflected on throwing away a 3-1 lead at the weekend “I think when you are 3-1 up with 10 minutes to go you think the game’s won, but the game lasts for 94 minutes or so.
“So I’m really disappointed for the players.
“I thought they put so much into it and I thought we were in control.
“I thought we limited Aberdeen to very few opportunities, especially second half.
“We had a great shape about us and I thought the goals we scored were terrific.
“I thought the players were outstanding, and I thought it was a really good game of football.
“We went to Pittodrie with a gameplan, and I think we’ve done well against Aberdeen this year.
“We’ve scored goals, we’ve caused them problems and I think that was probably the best away performance there’s been at Pittodrie this season.
“They were eight unbeaten with eight clean sheets, but I think we showed we’re not a bad team on our day.
“The goals we scored were terrific and I thought we had some really outstanding performances.
“I thought Greg Stewart was excellent on the left hand side for us, he did a job on Shay Logan and he caused him so many problems down that side.
“I thought Luka Tankulic did well, but overall I thought the players were great.
“We just switched off a wee bit and we seemed to get a wee bit tired in the last 10 minutes.
“We gave Aberdeen a lift with the penalty because we had quietened the crowd down and we felt that was important.
“I know we go a goal down after the first few minutes but I thought we worked our gameplan really well.”