Chris Waller is not afraid of a challenge and the role of Darley Australia head trainer is one he would consider - if it was offered.

Peter Snowden shocked the racing industry on Wednesday when he announced he would be quitting his post at Darley after the Sydney autumn carnival.

Waller, who trained four winners at Canterbury on Wednesday, admitted he was surprised by the news of Snowden's decision.

"Especially when he's going so well," Waller said.

"It's a very powerful operation and it will leave a good opportunity for someone."

When asked if it was an opportunity he would consider, Waller said he would be open to an approach.

"It would be a pleasure to be asked," he said.

However, the premier trainer also stressed the importance of the loyal band of owners and staff who have helped make his operation the most successful in Sydney racing.

Snowden trains privately for Darley and does not take horses from outside owners.

"It's an operation we've all got a lot of respect for," Waller said.

"You'd consider everything but we've got so many loyal people who have helped me get where I am and I'm not going to sacrifice them in a hurry.

"The staff and the owners have made Chris Waller racing, not Chris Waller."

Darley's managing director Henry Plumptre said a transition plan was in place to find a successor for Snowden and it was likely to come from within the Australian training ranks.

"There are names there that we're interested in but it's business as usual for the next five months and we're focusing on that," Plumptre said on Sky Racing.

"We will work through the process steadily and take our time."