Lee Freedman has quickly formed a high opinion of former West Australian Disposition who he believes can make a Group One impact in the Sir Rupert Clarke Stakes.

Saturday's Sir Rupert Clarke (1400m) at Caulfield will be the second start of Disposition's spring campaign and his second for Freedman and his training partner and brother, Anthony.

"He's got all the hallmarks of a good horse," Freedman said.

"Now's his time to prove it."

Disposition began his career with Grant Williams in Perth where he won two Listed races and ran second in last year's Group One Kingston Town Classic (1800m).

Owner Bob Peters sent him to Melbourne to give him his chance in the bigger races.

His two starts during the autumn for trainer Wez Hunter included a close second to Wandjina first-up in the CS Hayes Stakes at Flemington when he had 2.5kg more than the subsequent Australian Guineas winner.

Freedman said Disposition wasn't wound up when he stepped out first-up for his stable in a 1400m race at Flemington last Saturday week but the gelding still won like he expected.

"We were pleased to get that out of the road," Freedman said.

"He wasn't wound right up for that race and he still managed to win it. He's improved from that and he'll go to Caulfield next Saturday and I think will run very, very well.

"He's threatened to be a Group One horse for a little while now and I'm hoping next Saturday, whilst he's down in the weights being a handicap, he can achieve it."

Damien Oliver rode Disposition to win first-up.

"I think he if gets 54 (kilos) Damien will ride him (on Saturday)," Freedman said.