Sydney stewards have fined and suspended champion jockey Jim Cassidy for a week after charging him with aggressive whip riding.

The penalty was imposed after stewards completed an inquiry into Cassidy’s use of the whip on Grand Marshal when the Chris Waller-trained galloper won over 2000m at Rosehill on October 25.

Cassidy was charged with using the whip on 13 occasions in a forehand manner prior to the 100m, which is eight more than permitted under the rules.

Cassidy also pleaded guilty to the strokes being inclusive of 10 consecutive strikes.

Cassidy, who rode a wining double at Randwick on Saturday aboard Amovatio and Paris Match, was fined $1000 and suspended for seven days from Sunday. He can return to riding on November 16.

In assessing his penalty, the stewards took into account that Cassidy had not been penalised for whip use for over two years.

Kathy O’Hara also incurred a one week suspension from November 16 to November 23 after she pleaded guilty to a charge of careless riding on her mount Captain Scott in the last race at Randwick on Saturday.

Stewards found that near the 500m she rode her mount forward when racing to the inside of Skarsgard, resulting in Captain Scott becoming awkwardly placed when positioned close to the heels of Lofty Ambition.

In doing so Captain Scott shifted out abruptly, causing severe interference to Skarsgard and Melting Moment.

The stewards took into account K O'Hara’s guilty plea, her prior good record and also gave due regard to the fact that she had attempted at the last moment to restrain her mount to avoid causing interference.

Cassidy’s win on Paris Match on Saturday marked a change of fortune for the Anthony Cummings stable as she raced into contention for the summer feature races with a powerful win over 1200m.

The gutsy mare has recovered from a virus which struck down many of her stablemates early in the season and will now be set for the G2 Villiers Stakes at Randwick next month.

"She, like many of the good horses in our stable, has succumbed to a bit of bad luck in terms of viruses or bugs," said Edward Cummings.

"She'll go onwards and upwards from here.

"If she was to run well or win a race like the Villiers I think she'd be in a race like the Doncaster up to her ears."