Like McCoy, Johnson has won every major prize except the Grand National and his next winner will give him a 14th consecutive seasonal century.
"That's a fact lost on a lot of people," said Maguire. "He may be in McCoy's shadow, but to travel the length and breadth of the country as he has, and put in the work that he has to be on the doorstep of 2,000 winners is a testament to the man.
"It is a remarkable milestone, a phenomenal achievement and one that we should be shouting about."
Meanwhile, the Gary Moore-trained Harry Ticker has been supported for The Ladbroke, Saturday's two-mile Listed handicap hurdle at Ascot.
The five-year-old, beaten two lengths by Khyber Kim in the Grade 3 Greatwood Hurdle at Cheltenham last time, was cut to 6-1 (from 8s) with William Hill this morning.