Instead, Dobson has been put in joint charge of first-team affairs following Coyle's departure for Bolton, so Vince Overson will be in the home dugout.
It is a shame for McGuinness, but he knows Burnley are in safe hands until a permanent replacement is found.
"I know Martin very well because he was at Bury when my dad (former United boss Wilf) was there," said McGuinness.
"He was an excellent player and developed into a terrific young manager at Bury.
"He showed a real aptitude for the job and Burnley certainly couldn't have anyone better to be in charge just now."
Not that McGuinness will spend much time worrying about that tomorrow as United look to take another step nearer an historic 10th triumph in the prestigious Under-18 competition.
In defeating Birmingham in the last round, the Red Devils identified themselves as one of the favourites, with Paul Pogba - the French youngster Rennes were so unhappy about losing last summer - among the scorers.
McGuinness is delighted at the way Pogba has put the controversy surrounding his arrival at Old Trafford behind him as he looks to catch Sir Alex Ferguson's eye.
"I am really delighted with Paul," said McGuinness.
"It has not been easy for him but at least now all the talk is about his football.
"He knows, as do all the rest of our young players, what the Youth Cup means to Manchester United.
"The number of top players who have won the competition goes right back to Sir Matt Busby's days.
"So, while we would never do anything other than concentrate on our next game, knowing Burnley have an excellent youth set-up themselves, that carrot is always there at the end."