AP McCoy's trainer said the record-breaking jockey is so good he could win a race riding a monkey.
Jonjo O'Neill said after McCoy's 4,000th win:
Jockey AP McCoy said he felt "relieved" and "proud" after riding his 4,000th winner:
Racing broadcaster Clare Balding was among those to congratulate AP McCoy on riding his 4,000th winner, calling the jockey's feat "incredible":
AP McCoy's fellow sportsmen took to Twitter to congratulate the jockey on his landmark 4,000th career win.
Former Liverpool striker Robbie Fowler, Irish golfer Shane Lowry and ex-England rugby union captain Matt Dawson were among those to pay tribute to the record-breaking rider also known as Tony McCoy:
Jockey AP McCoy has won his 4,000th race, riding Mountain Tunes to victory in the 1510 at Towcester.
Record-breaking jockey Tony McCoy is one victory away from 4,000 wins and could reach that astonishing milestone today.
The 18-time champion jockey moved to 3,999 wins after winning on Minella For Steak at Chepstow yesterday.
The Northern Irishman has two rides at Towcester today where he could reach the unprecedented landmark.
McCoy will ride Church Field at 2.10pm which is the 3/1 favourite and Mountain Tunes an hour later which is also the favourite at 6/4.
Record-breaking jockey Tony McCoy will not reach 4,000 race wins today after failing to win the first two of his three rides in Exeter.
However, our sports correspondent Ian Payne said: "Such is the relentless nature of horse racing, McCoy could reach that milestone tomorrow at Chepstow where he has a couple more rides.
"He is a total phenomenon, he's won the championship for jockeys 18 times and he is going for his 19th this year."
The 18-time champion jockey finished second on his opening race on Flemenson, seventh on Keen Eye in his second ride and has one more race at Exeter today.
Record-breaking jockey Tony McCoy, who is only two race wins short of reaching an astonishing 4,000 jump victories, downplayed his chances of completing that feat at Exeter today.
The Northern Irishman, who has three rides at Exeter, told the Guardian he had "bits of chances" to complete that milestone today.
He said: "I wouldn't say they're good chances. Flemenson won at Uttoxeter the last day, he's probably my best chance. Well Hello There fell last time and I think the one in the hurdle is probably not much good."
McCoy currently has 3,998 victories over his 18-year career and his first race starts at 1.50pm today, followed by another at 2.20pm and the last at 3.50pm.