Four-year-old sprinter Perturbo has emerged as an unlikely Group One contender for trainers Colin and Cindy Alderson.The Jugah gelding was considered a useful young horse capable of winning his share of his races but an explosive victory at Flemington two starts ago has led to him contesting Sunday's The Goodwood (1200m) at Morphettville."We probably didn't have a particularly high opinion of him early," Cindy Alderson said."He'd shown enough that he could win a race or two but I certainly would

Four-year-old sprinter Perturbo has emerged as an unlikely Group One contender for trainers Colin and Cindy Alderson.

The Jugah gelding was considered a useful young horse capable of winning his share of his races but an explosive victory at Flemington two starts ago has led to him contesting Sunday's The Goodwood (1200m) at Morphettville.

"We probably didn't have a particularly high opinion of him early," Cindy Alderson said.

"He'd shown enough that he could win a race or two but I certainly would never have imagined we would be lining up in a Group One with him."

Perturbo has won six of his 15 starts and has been a different horse at his last two starts when ridden back at Flemington.

He reeled off stunning sectionals when he came from last in a field of 11 to beat Happy Glen over 1000 metres on April 10 and last Sunday just failed to repeat the effort over 1200m when beaten a half-head by Good Medicine.

"He's been one of horses who has been progressive the whole way through," Alderson told radio station Sport 927.

She said she thought Perturbo's Flemington win was a "one off" but when he ran so well again last week he booked his place in The Goodwood.

"He has kept improving and is in great form," Alderson said.

"He deserves a crack at it."

Stablemate Sea Galleon is one of the fancies for Sunday's South Australian Derby (2500m) and Alderson hasn't ruled out a change of tactics on the son of Galileo.

He has been ridden back at most of his seven starts but gave away an impossible start in last Sunday's VRC St Leger (2800m).

"He stood them up a pretty big start at top of straight and I was pretty impressed he was able to get so close to them (at the finish)," Alderson said.

Beaten only 2-1/2 lengths, he finished fifth to Exceptionally after producing a similar fast-finishing burst from near last to finish third to Rundle in the Galilee Series Final (2500m) at Flemington on April 10.

"He hasn't had that many breaks go his way this campaign but hopefully on Sunday they might," Alderson said.

She said it was possible that Sea Galleon would be ridden more forward in the Derby and may even lead.

"I always liked the horse from day one and I have got a bit of a soft spot for him," Alderson said.

"As his campaign has gone on and he's had more racing he has impressed with the way he has adapted.

"He hasn't won a race since his first start this campaign but his runs have been full of merit each time."