The Fir Park club have been linked with a loan bid for the 20-year-old Hoops playmaker.
But McCall is desperate to find a pacey wideman to balance off his team and admits that Scotland Under-21 international McGeouch's preference for playing through the middle means a switch is unlikely.
He said: "Dylan is a player that I'm led to believe Celtic will look, possibly, to loan out. He is a very good player. But, again, I'm led to believe probably does not want to play out-and-out right wing and that it is not his best position.
"That is the place in the team that we are really looking for so as much as I rate him, I don't want to bring anyone to the club for a position that they are not really keen on."
McCall has been thwarted in a number of attempts so far this summer to fill the void on the right side of his midfield left after Jamaican international Chris Humphrey departed for Preston.
However, with more than a week left until the transfer window shuts, he is not panicking yet.
"Bringing in a wide player is proving difficult," admitted the Steelmen manager. "We have had five or six players in over the last two months on trial, who for whatever reason have not really been what we are after.
"In the last 10 days we have had three lads targeted from English clubs to come up on loan. One decided at the last minute that Scotland wasn't for him at this time in his career.
With the second it was a financial issue where we just couldn't pay what the club was after, the third did not happen because he has to come up window to window and his club was worried that if he failed to settle or get into the team, we would not be able to send him back.
"So they are the little stumbling blocks we have faced but we are still hopeful of managing to get someone in. But it has to be someone who will improve us, not just someone for the sake of it."
Motherwell will have to go with the squad they have as they take on Scottish Premiership new boys Partick Thistle at home on Saturday, and defender Stephen McManus has warned they will take on a side high in confidence after the First Division champions survived their first four games of the new season without suffering defeat.
The former Celtic captain said: "Thistle have got a young squad without much top-flight experience but their start to the season has not surprised me. They have young players who don't really have any fear.
"You are like that when you are young. You look forward to every game and you are not aware of the pressures. You just go out to play.
"I know some of the lads there like Scott Fox and Stephen O'Donnell, who used to be at Celtic.
They have maybe had rejection when they were young kids but they have gone there to enjoy their football and have done tremendously well so far. They have got a team to be proud of right now."