Trainer Luca Cumani hopes fellow Italian Frankie Dettori can put his six-month suspension behind him as soon as possible for the good of racing.
The three-times British champion jockey, 41, tested positive for what is believed to be cocaine following a routine examination at Longchamp on September 16.
Cumani gave Dettori his first job in British racing as an apprentice in 1985 before he went on to become the Newmarket trainer's stable jockey, enjoying great success together before Dettori moved on to become retained jockey to Sheikh Mohammed's operation Godolphin.
Cumani told Press Association Sport: "I'm sad that this has happened and hope it doesn't happen again. He is the best jockey that has been around for quite a while and a great ambassador for the sport.
"He has done a world of good to the sport and let's hope he can put this behind him quickly and go back to where he was."
The Professional Jockeys Association intend to look at the mental well-being of their members and give riders any support they might require.
Paul Struthers, PJA chief executive, said: "As in any walk of life jockeys will make mistakes. Frankie Dettori has made such a mistake and accepted the consequences of it, and if he needs any support the PJA and Injured Jockeys Fund between them can provide that.
"The wider issue of jockeys' mental well-being is something the PJA cares passionately about.
"As well as all the normal pressures that other sportsmen and women have to contend with, unlike many other sports jockeys have the added pressures of massively reduced calorific intake and are constantly at very real risk of serious injury.
"Jockeys in Great Britain have an excellent support structure in place in many respects. This is true when it comes to mental well-being, but whilst the support is there, racing perhaps lags behind other sports particularly when it comes to raising awareness of the issues and the support that is available, and it is overdue that more was done."
10 October 2015Mangan hoping for Munster magic from Perfect Promise
Massaat leads Sheikh Hamdan assault on Dewhurst at Newmarket
Sir Mark Prescott bids to end Cesarewitch drought
Aidan O'Brien: Every chance Gleneagles will run at Ascot
Breeders' Cup 'possibility' for King George winner Postponed
'Truly exceptional' Minding has Ryan Moore purring after Fillies' Mile
Cable Bay proves up to the Challenge for Frankie Dettori
Victory for Saeed bin Suroor's First in Oh So Sharp Stakes
Jack Hobbs delights John Gosden in Newmarket gallop
Gifted Master in 'sparkling form' for Autumn Stakes, says Hugo Palmer
Marco Botti sprint star sent Trophy-hunting at York
9 October 2015Tony Martin trio revved up for Cesarewitch challenge
Quiet Reflection storms to Newmarket success for Karl Burke
Mouse Morris seeks Munster National divinity with Rogue Angel
Dynaste makes French connection for David Pipe
Hugo Palmer cool on Covert Love Breeders' Cup bid
Tote Jackpot to undergo major facelift
Air Force Blue 'very popular' ahead of red-hot Dewhurst
Dhahmaan enters uncharted territory at York for Marco Botti
Classy Lumiere to stay with Mark Johnston
Mystifiable defies absence to reward Exeter backers
Andrew Balding lines up raid on Balmoral Handicap
Paul Townend hit with ten-day ban at Tramore
Jonjo O'Neill outlines chasing plan for More Of That
Marcus Tregoning's promising Alamode returns in Oh So Sharp Stakes
Promising Run on Mile high for Newmarket quest
Karl Burke pauses for Quiet Reflection in Cornwallis
Godolphin and Local Time playing for Pride at Newmarket
Shining Emerald gleaming for Newmarket Challenge
8 October 2015Lengthy whip ban for Pat Dobbs
Powerful Aidan O'Brien squad leaves for Melbourne
Godolphin ace Emotionless in demand for Dewhurst
Francois Doumen sets sail for Ascot with Sea Calisi
Sire De Grugy 'unlikely to run' at Chepstow, says Gary Moore
Clever Cookie team sweet on Long Distance Cup at Ascot
Champions Day looks divine for Gabriel's Lad
Godolphin set to supplement Racing History for Champion Stakes at Ascot
One-day bans for riders in Kempton 'wrong stalls' incident
Ryan Moore takes the plaudits with Nottingham victory
Bertimont injury blow for Dan Skelton
Winning start over fences for smart hurdler Violet Dancer
Grand National winner Pineau De Re set for final season
Gordon Elliott outlines early plans for stable star Don Cossack
Sam Twiston-Davies relishing top job with Paul Nicholls
Aidan O'Brien's Minding and Coolmore lead Fillies' Mile field at Newmarket
Aidan O'Brien decides against sending Order Of St George to Melbourne
7 October 2015Wesley Ward keen to secure Frankie Dettori for Breeders' Cup rides
Nick Attenborough and John Blake take up charity roles
Rain wanted for Cirrus Des Aigles ahead of Champions Day at Ascot
New series of races announced by BHA and Jockey Club Racecourses
Andre Fabre waiting on Esoterique Breeders' Cup decision
Nicky Richards considering Cheltenham target for Simply Ned
Ascot ground key to Decorated Knight's QEII run
Market Rasen option for Malcolm Jefferson's Cyrus Darius
Air Force Blue on track for Dewhurst - Aidan O'Brien
Frankie Dettori dreaming of America for Golden Horn
Mecca's Angel ruled out of Champions Sprint reckoning
Guineas heroine Legatissimo likely to race on in 2016
Eduard injury blow for Nicky Richards
Paddy Power option for David Pipe's Kings Palace
Andre Fabre unveils Lockinge option for Make Believe
Andre Fabre hoping for 2016 campaign with Arc third New Bay
Henry Candy eager to step up to a mile with Foret second Limato